I voted warlock because they have the worst jump for me. Floofing about has gotten me killed more times than I care to admit. Otherwise all three classes are all very useful in their own right. IMO, Voidwalker is the best PVP subclass: blink, ranged super/countering super, tracking grenade, powerful and far reaching melee, and great exotic armor. Hunter is my favorite class in general, it's just so rewarding and versatile in any situation. Titans are great, Striker is what I would main if there wasn't a Hunter, and Defenders are always welcome whatever the situation.