Draenei automatically have the upperhand as far as Alliance races go. They can cast a HoT (Heal over Time) which is useful in almost any situation.

Horde racial bonuses are stupid-overpowered. It doesn't really matter what you pick as your race. Undead can eat people though. That's fun.

I play a gnome mage who is fun although boring. My Night Elf Priest (Currently Shadow Spec) is fun somewhat.

Server-wise, Draka has the highest concentration of EoFF people but is not very end game worthy.