In SWTOR, my main is a Focus spec Guardian (read: melee AOE burst DPS with lots of mobility abilities) and I would like to try something like that in WoW. An RL friend of mine recommended a Retribution Paladin for a similar playstyle (and the notion of being able to dual-spec for healing DOES appeal to me), but another friend thinks Warrior would be the class of choice for me due to the extra mobility abilities (leap, charge, ect.). Of these 2 friends, one quit a couple of year ago and the other just started again and hasn't tried endgame PvP yet, so neither of these guys really know what your metagame looks like.
My question boils down to this: how do the two compare in PvP? I don't know how class balance is in this game and I don't want to level a new character just to find out they are gimped at 90.