x5 main Sov + x4 Triumph with the ring should be BiS for pretty much all playstyles - solo, group or wb, Evil already mentioned which pieces to get
However Triumph is a long way to get, as an easier option I suggest Vale-Walker set from Hunter's Vale
It takes basically just a week to get (1 piece per run, 18hours lockout) and has a ring, so you can run 4 pieces combo with 5piece sov (pretty much same setup as with Triumph)
Vale-Walker set gives more Wounds and Weaponskill than Warlord and in combination with x5 Sov will give more stats overall and with better selection IMO.
WL Melee Power bonus is neat, but just like strength it will have diminishing returns if you are at high STR already, its better to diversify your offensive stats between mainstat/power, crit%, armorpen (which 5piece Sov does) and also invest a bit more into wouns (provied by Vale Walker).
WL's AA haste is a neat bonus, but im not convinced if +15% is strong enough, considering you'll spend a fair amount of time casting channeled attacks (RoA & Retrib) that prevent auto-attacks from firing off.
Also with Vale-Walker you get an option to drop 4th piece bonus (which is just Strength) and do something more interesting:
a) swap to 6piece Sov & 3 piece VW to get 2 extra mastery points, which allows you to get heal debuff and either a tactic or one of the remaining Skaven abilities (No Escape can be really good as an extra Snare with extended 30ft range) in addition to the 3 biggest skills (RoA, ID, Rampage).
b) add Grimshimmer chestpiece for massive 184 hp regen bonus, with the Pocket Keg and VW Ring you'll be at whopping 312 hp/4 at a very little cost, its might not save you in a fight, but it will make random shaman/magus dots a lot less threatening.
p.s. we have channels in our guild's discord for these kinds of questions
