[DrKvothe]

At end-game, racial choices don't matter much due to the disproportionate power of our spells/epic. At 60, your power level relative to another shaman depends on torpor, epic, malo, and then things like clicky buffs, hp/resist gear, and other high end shaman spells (dots, 55 pet, etc.). These things costs platinum, and your platinum farming speed is highly level dependent, so you could argue that the strongest race is the one that gets you to 60 the fastest (and thus gives you a head start in funding torpor and post-torpor purchases).

So the "best race" will be the one that gets you to 60 the fastest. That's going to depend somewhat on how experienced you are with the game. Being non-kos to most humanoids is helpful if you're unfamiliar with most of the leveling zones or if you want to exploit all of the really OP turn-in quests early on, in which case barbarian wins. On the other hand, regen is really, really nice. Between troll and iksar: iksar has more faction problems, they have different leveling zones (depends on your tastes and experience with these zones), trolls get a neat snare clicky, iksars have a harder time getting to EC for 55/5 rings if you're untwinked, trolls are really fat and ugly, iksars can't use JBB. The importance of each of these minor factors depends on your knowledge of the game and personal preferences.

I'm tempted to roll an iksar shaman just to level through the kunark zones. I get bored of every other class =(