Long-time solo-roaming WL here, this is the build I use:
RoR.builders - White Lion
Feel free to use Flanking instead of Tearing Blade tactic, if you prefer it. You get the best of all three trees + Throat Bite which can be very useful and at least partially negate the need for heal debuff, if you have the misfortune of fighting a healer.
The build requires +2 from the Pridelord Sovereign set. Personally I combine with three Sentinel pieces - Steelhelm, Wristguards and Lionmark as well as standard equipment - Bloodlord Greataxe, Exquisite Gunbad Diamond, Bloodmoon Lionmark/Rough Gunbad Ruby. You can also go for three pieces from the Triumphant set instead of Sentinel - there are some very good options, if you are not committing to Critical Chance like myself.
Regarding the regen/deftard build - it is a meme build that requires no skill and falls flat on its face the moment you are not in a 1v1 situation. It also locks you completely out of group play. It gives you no extra edge compared to burst builds, it just makes you kill things slower, which is a big no-no for a character like WL with no reliable means of escape (unlike WE/Wh, who also have a heal ability, which WL does not have). It is only good against other regen/deftard builds.
Experienced players will figure out your strategy almost immediately (3 skills into rotation at most) and will just slow/stun you, detaunt and disengage until you run into a warcamp or some other players at which point you are dead. Even if you do manage to get a kill by some miracle, nobody will come back to where you were last spotted with your troll build - better yet, they will come with a buddy and farm you for fun.
The elegance and power of the WL is in the burst damage and the ability to chase down and dispatch quickly. As any good solo roamer will tell you, the quicker you kill your target the better - lest a destro warband comes around and bashes your skull in because you needed 5 minutes to kill a RDPS.