since you can query and use all the data the killboard is using and showing (pretty cool!) I though Id try and do some analysis.
Here is what I have so far, which is based on the killboard SC data of around 23000 T1-T4 scenarios within the last two month:
SC STANDARD/T4 - Total SCs evaluated: 13596
SC STANDARD/T4 - Order SCs rounds won: 7394 of 13596
SC STANDARD/T4 - Destro SCs rounds won: 6202 of 13596
SC STANDARD/T4 - Order with more players: 2200 of 13596
SC STANDARD/T4 - Destro with more players: 2200 of 13596
SC STANDARD/T4 - Order with +1 player: 1669 of 13596
SC STANDARD/T4 - Destro with +1 player: 1670 of 13596
SC STANDARD/T4 - Order with +2 players: 373 of 13596
SC STANDARD/T4 - Destro with +2 players: 385 of 13596
SC STANDARD/T4 - Order with >= +3 players: 158 of 13596
SC STANDARD/T4 - Destro with >= +3 players: 145 of 13596
SC STANDARD/T4 - Order side with no tanks: 381 of 13596
SC STANDARD/T4 - Destro side with no tanks: 382 of 13596
SC STANDARD/T4 - Order side with no healers: 203 of 13596
SC STANDARD/T4 - Destro side with no healers: 221 of 13596
SC STANDARD/T4 - Order side with no dps: 3 of 13596
SC STANDARD/T4 - Destro side with no dps: 11 of 13596
SC STANDARD/T4 - Order side no healers and won: 37 of 13596
SC STANDARD/T4 - Destro side no healers and won: 25 of 13596
SC STANDARD/T4 - Order side no healers and loss: 166 of 13596
SC STANDARD/T4 - Destro side no healers and loss: 196 of 13596
SC STANDARD/T4 - Order side no tanks and won: 107 of 13596
SC STANDARD/T4 - Destro side no tanks and won: 101 of 13596
SC STANDARD/T4 - Order side no tanks and loss: 274 of 13596
SC STANDARD/T4 - Destro side no tanks and loss: 281 of 13596
SC STANDARD/T4 - Order dominating SC with > 3x Destro kills done: 4655 of 13596
SC STANDARD/T4 - Destro dominating SC with > 3x Order kills done: 4122 of 13596
SC STANDARD/T4 - Balanced SCs (neither dominating, kills <= 3x other kills): 4819 of 13596
SC STANDARD/T4 - Order having 2/2/2 comp (1/3 tanks, 1/3 healers, 1/3 dps): 806 of 13596
SC STANDARD/T4 - Destro having 2/2/2 comp (1/3 tanks, 1/3 healers, 1/3 dps): 722 of 13596
SC STANDARD/T4 - Order having 2/2/2 comp and won (independent of Destro comp): 594 of 13596
SC STANDARD/T4 - Destro having 2/2/2 comp and won (independent of Order comp): 459 of 13596
SC STANDARD/T4 - Order 2/2/2 vs Destro 2/2/2 and Order won: 30 of 13596
SC STANDARD/T4 - Destro 2/2/2 vs Order 2/2/2 and Destro won: 23 of 13596
SC STANDARD/T4 - Order 2/2/2 comp vs Destro with no 2/2/2: 753 of 13596
SC STANDARD/T4 - Destro 2/2/2 comp vs Order with no 2/2/2: 669 of 13596
SC STANDARD/T4 - Order 2/2/2 comp vs Destro with no 2/2/2 and won:564 of 13596
SC STANDARD/T4 - Destro 2/2/2 comp vs Order with no 2/2/2 and won: 436 of 13596
SC STANDARD/T4 - Order 2/2/2 comp vs Destro with no 2/2/2 and loss: 189 of 13596
SC STANDARD/T4 - Destro 2/2/2 comp vs Order with no 2/2/2 and loss: 233 of 13596
SC STANDARD/T4 - Order avg % of tanks in SC: 25,11
SC STANDARD/T4 - Destro avg % of tanks in SC: 25,7
SC STANDARD/T4 - Order avg % of healers in SC: 29,52
SC STANDARD/T4 - Destro avg % of healers in SC: 29,44
SC STANDARD/T4 - Order avg % of dps in SC: 45,37
SC STANDARD/T4 - Destro avg % of dps in SC: 44,86
SC STANDARD/T4 - Order avg % of mdps in SC: 24,95
SC STANDARD/T4 - Destro avg % of mdps in SC: 23,7
SC STANDARD/T4 - Order avg % of rdps in SC (SW as rpds): 20,42
SC STANDARD/T4 - Destro avg % of rdps in SC (SH as rdps): 21,17
SC STANDARD/T3 - Total SCs evaluated: 8755
SC STANDARD/T3 - Order SCs rounds won: 3995 of 8755
SC STANDARD/T3 - Destro SCs rounds won: 4760 of 8755
SC STANDARD/T3 - Order with more players: 1521 of 8755
SC STANDARD/T3 - Destro with more players: 929 of 8755
SC STANDARD/T3 - Order with +1 player: 1275 of 8755
SC STANDARD/T3 - Destro with +1 player: 793 of 8755
SC STANDARD/T3 - Order with +2 players: 209 of 8755
SC STANDARD/T3 - Destro with +2 players: 116 of 8755
SC STANDARD/T3 - Order with >= +3 players: 37 of 8755
SC STANDARD/T3 - Destro with >= +3 players: 20 of 8755
SC STANDARD/T3 - Order side with no tanks: 438 of 8755
SC STANDARD/T3 - Destro side with no tanks: 181 of 8755
SC STANDARD/T3 - Order side with no healers: 310 of 8755
SC STANDARD/T3 - Destro side with no healers: 216 of 8755
SC STANDARD/T3 - Order side with no dps: 3 of 8755
SC STANDARD/T3 - Destro side with no dps: 22 of 8755
SC STANDARD/T3 - Order side no healers and won: 68 of 8755
SC STANDARD/T3 - Destro side no healers and won: 56 of 8755
SC STANDARD/T3 - Order side no healers and loss: 242 of 8755
SC STANDARD/T3 - Destro side no healers and loss: 160 of 8755
SC STANDARD/T3 - Order side no tanks and won: 129 of 8755
SC STANDARD/T3 - Destro side no tanks and won: 60 of 8755
SC STANDARD/T3 - Order side no tanks and loss: 309 of 8755
SC STANDARD/T3 - Destro side no tanks and loss: 121 of 8755
SC STANDARD/T3 - Order dominating SC with > 3x Destro kills done: 2086 of 8755
SC STANDARD/T3 - Destro dominating SC with > 3x Order kills done: 2505 of 8755
SC STANDARD/T3 - Balanced SCs (neither dominating, kills <= 3x other kills): 4164 of 8755
SC STANDARD/T3 - Order having 2/2/2 comp (1/3 tanks, 1/3 healers, 1/3 dps): 218 of 8755
SC STANDARD/T3 - Destro having 2/2/2 comp (1/3 tanks, 1/3 healers, 1/3 dps): 476 of 8755
SC STANDARD/T3 - Order having 2/2/2 comp and won (independent of Destro comp): 150 of 8755
SC STANDARD/T3 - Destro having 2/2/2 comp and won (independent of Order comp): 312 of 8755
SC STANDARD/T3 - Order 2/2/2 vs Destro 2/2/2 and Order won: 13 of 8755
SC STANDARD/T3 - Destro 2/2/2 vs Order 2/2/2 and Destro won: 7 of 8755
SC STANDARD/T3 - Order 2/2/2 comp vs Destro with no 2/2/2: 198 of 8755
SC STANDARD/T3 - Destro 2/2/2 comp vs Order with no 2/2/2: 456 of 8755
SC STANDARD/T3 - Order 2/2/2 comp vs Destro with no 2/2/2 and won:137 of 8755
SC STANDARD/T3 - Destro 2/2/2 comp vs Order with no 2/2/2 and won: 305 of 8755
SC STANDARD/T3 - Order 2/2/2 comp vs Destro with no 2/2/2 and loss: 61 of 8755
SC STANDARD/T3 - Destro 2/2/2 comp vs Order with no 2/2/2 and loss: 151 of 8755
SC STANDARD/T3 - Order avg % of tanks in SC: 23,47
SC STANDARD/T3 - Destro avg % of tanks in SC: 29,1
SC STANDARD/T3 - Order avg % of healers in SC: 23,67
SC STANDARD/T3 - Destro avg % of healers in SC: 27,63
SC STANDARD/T3 - Order avg % of dps in SC: 52,86
SC STANDARD/T3 - Destro avg % of dps in SC: 43,27
SC STANDARD/T3 - Order avg % of mdps in SC: 26,57
SC STANDARD/T3 - Destro avg % of mdps in SC: 23,07
SC STANDARD/T3 - Order avg % of rdps in SC (SW as rpds): 26,29
SC STANDARD/T3 - Destro avg % of rdps in SC (SH as rdps): 20,2
SC STANDARD/T1 - Total SCs evaluated: 4443
SC STANDARD/T1 - Order SCs rounds won: 2276 of 4443
SC STANDARD/T1 - Destro SCs rounds won: 2167 of 4443
SC STANDARD/T1 - Order with more players: 841 of 4443
SC STANDARD/T1 - Destro with more players: 568 of 4443
SC STANDARD/T1 - Order with +1 player: 707 of 4443
SC STANDARD/T1 - Destro with +1 player: 483 of 4443
SC STANDARD/T1 - Order with +2 players: 118 of 4443
SC STANDARD/T1 - Destro with +2 players: 68 of 4443
SC STANDARD/T1 - Order with >= +3 players: 16 of 4443
SC STANDARD/T1 - Destro with >= +3 players: 17 of 4443
SC STANDARD/T1 - Order side with no tanks: 286 of 4443
SC STANDARD/T1 - Destro side with no tanks: 213 of 4443
SC STANDARD/T1 - Order side with no healers: 185 of 4443
SC STANDARD/T1 - Destro side with no healers: 150 of 4443
SC STANDARD/T1 - Order side with no dps: 2 of 4443
SC STANDARD/T1 - Destro side with no dps: 10 of 4443
SC STANDARD/T1 - Order side no healers and won: 60 of 4443
SC STANDARD/T1 - Destro side no healers and won: 42 of 4443
SC STANDARD/T1 - Order side no healers and loss: 125 of 4443
SC STANDARD/T1 - Destro side no healers and loss: 108 of 4443
SC STANDARD/T1 - Order side no tanks and won: 122 of 4443
SC STANDARD/T1 - Destro side no tanks and won: 90 of 4443
SC STANDARD/T1 - Order side no tanks and loss: 164 of 4443
SC STANDARD/T1 - Destro side no tanks and loss: 123 of 4443
SC STANDARD/T1 - Order dominating SC with > 3x Destro kills done: 917 of 4443
SC STANDARD/T1 - Destro dominating SC with > 3x Order kills done: 826 of 4443
SC STANDARD/T1 - Balanced SCs (neither dominating, kills <= 3x other kills): 2700 of 4443
SC STANDARD/T1 - Order having 2/2/2 comp (1/3 tanks, 1/3 healers, 1/3 dps): 103 of 4443
SC STANDARD/T1 - Destro having 2/2/2 comp (1/3 tanks, 1/3 healers, 1/3 dps): 153 of 4443
SC STANDARD/T1 - Order having 2/2/2 comp and won (independent of Destro comp): 63 of 4443
SC STANDARD/T1 - Destro having 2/2/2 comp and won (independent of Order comp): 103 of 4443
SC STANDARD/T1 - Order 2/2/2 vs Destro 2/2/2 and Order won: 3 of 4443
SC STANDARD/T1 - Destro 2/2/2 vs Order 2/2/2 and Destro won: 3 of 4443
SC STANDARD/T1 - Order 2/2/2 comp vs Destro with no 2/2/2: 97 of 4443
SC STANDARD/T1 - Destro 2/2/2 comp vs Order with no 2/2/2: 147 of 4443
SC STANDARD/T1 - Order 2/2/2 comp vs Destro with no 2/2/2 and won:60 of 4443
SC STANDARD/T1 - Destro 2/2/2 comp vs Order with no 2/2/2 and won: 100 of 4443
SC STANDARD/T1 - Order 2/2/2 comp vs Destro with no 2/2/2 and loss: 37 of 4443
SC STANDARD/T1 - Destro 2/2/2 comp vs Order with no 2/2/2 and loss: 47 of 4443
SC STANDARD/T1 - Order avg % of tanks in SC: 22,86
SC STANDARD/T1 - Destro avg % of tanks in SC: 25,83
SC STANDARD/T1 - Order avg % of healers in SC: 24,42
SC STANDARD/T1 - Destro avg % of healers in SC: 26,52
SC STANDARD/T1 - Order avg % of dps in SC: 52,72
SC STANDARD/T1 - Destro avg % of dps in SC: 47,65
SC STANDARD/T1 - Order avg % of mdps in SC: 25,44
SC STANDARD/T1 - Destro avg % of mdps in SC: 24,52
SC STANDARD/T1 - Order avg % of rdps in SC (SW as rpds): 27,28
SC STANDARD/T1 - Destro avg % of rdps in SC (SH as rdps): 23,13
SC CITY/T4 - Total SCs evaluated: 213
SC CITY/T4 - Order SCs rounds won: 134 of 213
SC CITY/T4 - Destro SCs rounds won: 79 of 213
SC CITY/T4 - Order with more players: 26 of 213
SC CITY/T4 - Destro with more players: 26 of 213
SC CITY/T4 - Order with +1 player: 19 of 213
SC CITY/T4 - Destro with +1 player: 20 of 213
SC CITY/T4 - Order with +2 players: 2 of 213
SC CITY/T4 - Destro with +2 players: 2 of 213
SC CITY/T4 - Order with >= +3 players: 5 of 213
SC CITY/T4 - Destro with >= +3 players: 4 of 213
SC CITY/T4 - Order side with no tanks: 9 of 213
SC CITY/T4 - Destro side with no tanks: 14 of 213
SC CITY/T4 - Order side with no healers: 3 of 213
SC CITY/T4 - Destro side with no healers: 2 of 213
SC CITY/T4 - Order side with no dps: 0 of 213
SC CITY/T4 - Destro side with no dps: 0 of 213
SC CITY/T4 - Order side no healers and won: 0 of 213
SC CITY/T4 - Destro side no healers and won: 0 of 213
SC CITY/T4 - Order side no healers and loss: 3 of 213
SC CITY/T4 - Destro side no healers and loss: 2 of 213
SC CITY/T4 - Order side no tanks and won: 2 of 213
SC CITY/T4 - Destro side no tanks and won: 1 of 213
SC CITY/T4 - Order side no tanks and loss: 7 of 213
SC CITY/T4 - Destro side no tanks and loss: 13 of 213
SC CITY/T4 - Order dominating SC with > 3x Destro kills done: 102 of 213
SC CITY/T4 - Destro dominating SC with > 3x Order kills done: 65 of 213
SC CITY/T4 - Balanced SCs (neither dominating, kills <= 3x other kills): 46 of 213
SC CITY/T4 - Order having 2/2/2 comp (1/3 tanks, 1/3 healers, 1/3 dps): 91 of 213
SC CITY/T4 - Destro having 2/2/2 comp (1/3 tanks, 1/3 healers, 1/3 dps): 89 of 213
SC CITY/T4 - Order having 2/2/2 comp and won (independent of Destro comp): 59 of 213
SC CITY/T4 - Destro having 2/2/2 comp and won (independent of Order comp): 37 of 213
SC CITY/T4 - Order 2/2/2 vs Destro 2/2/2 and Order won: 43 of 213
SC CITY/T4 - Destro 2/2/2 vs Order 2/2/2 and Destro won: 23 of 213
SC CITY/T4 - Order 2/2/2 comp vs Destro with no 2/2/2: 25 of 213
SC CITY/T4 - Destro 2/2/2 comp vs Order with no 2/2/2: 23 of 213
SC CITY/T4 - Order 2/2/2 comp vs Destro with no 2/2/2 and won:16 of 213
SC CITY/T4 - Destro 2/2/2 comp vs Order with no 2/2/2 and won: 14 of 213
SC CITY/T4 - Order 2/2/2 comp vs Destro with no 2/2/2 and loss: 9 of 213
SC CITY/T4 - Destro 2/2/2 comp vs Order with no 2/2/2 and loss: 9 of 213
SC CITY/T4 - Order avg % of tanks in SC: 29,65
SC CITY/T4 - Destro avg % of tanks in SC: 28,91
SC CITY/T4 - Order avg % of healers in SC: 30,88
SC CITY/T4 - Destro avg % of healers in SC: 30,95
SC CITY/T4 - Order avg % of dps in SC: 39,47
SC CITY/T4 - Destro avg % of dps in SC: 40,14
SC CITY/T4 - Order avg % of mdps in SC: 27,16
SC CITY/T4 - Destro avg % of mdps in SC: 25,2
SC CITY/T4 - Order avg % of rdps in SC (SW as rpds): 12,31
SC CITY/T4 - Destro avg % of rdps in SC (SH as rdps): 14,94
About dps: I classified a Healing class (RP, Zealot, AM, Shaman, WP, Dok) as DPS when their damage was > their healing in a round. Mdps is only Slayer, Choppa, Mara, WL, WE and WH, all other dps are rdps (Sorcs, BW, ... and Healers with damage > healing). For SW and SH can't determine if they played ranged or melee, so they are just rdps. Tanks are SM, BO, IB, BG, Chosen and Knight no matter if they did damage or not.
Let me know what you think about it and what your findings are. Some things jumped into my eyes but try to figure out yourself first

More data coming soon. Gonna try to do some kind of class breakdown with the SC data next.