i normally go for who looks the best and who has a good ability.

Humans for alliance as they look good in amour and also there ability to see stealth as it is very good in duels when a lower level and other cases.also gnomes dont need escape artist as we are casters,not warriors! plus humans look so craty when doing any pro!!!

blood elf is the best horde race as they are wicked dancers,and look sooooo cool in epic gear,also for there mana regaining ability.