Oh, i forgot, iksar can't use JBB's. That's baaaad
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To summise, there's bonuses and flaws for each.
Barbs = less exp penalty, higher starting wis, good race
ogre = should have frontal stun immunity eventually (high stam), evil race
troll = innate regen (high stam), evil race
iksar = innate regen, ac bonus, can't use plate though (JBB), hated race
There's other pros and cons, but these are the main ones i think.