I'm firmly in the vengeance camp for pvp. Tried tanking in pvp, but didn't like it as much since I can always toss my taunts as a Vengeance spec.
Rage is "better" if only for the fact that the derp smash can hit more than 1 enemy at a time, but really that tree is a one trick pony if I have ever seen one. It's much more amusing for me to leap to someone, have unstoppable go off and people spam cc at me and it just bounce off.
The fact I'm a fan of the animations for ravage, impale, and shatter probably don't dampen my enthusiasm for it. Oh. And vicious throws at opponents above execute range, what's not to like about that?