I average a 1.45 as a titan in my main gametype, skirmish. Average 1.54 as a Hunter. I don't play Warlock, not yet anyway. However, in all crucible variations my hunter trumps my titan k/d. Nothing really changes except the minor gear perks between the 2 classes. I run last word, found verdict, and zombie apocalypse between my characters. From my pool of data I can conclude hunters are better for pvp than titans. I'm certain I could find gear with identical perks for both classes with the same weapons and the hunter will continue to sport the better k/d.