both subclasses have some awesome stuff going for it. But this is what i think is important to me in pvp. the specials i consider similar to heavy weapons machine gun and rocket launcher warlock=RL sunsinger=machine gun so id say while the warlocks special is cool, sunsingers is arguably more kills, tho not necesarrily as clutch further sunsingers buffs cater to a great mid to short range playstyle that i love...especially with the damage reduction, shield on melee, and i love grenades. however warlock has a teleport...that cannot be understated on how useful it is. ill use both for pvp eventually, ugh...but wich one do you like?