When WoW was first released there were only 8 races. Since then, another 5 have been added. But I want to know what race you feel has the greatest story to tell? Is it the Undead, who's only existence was fuelled by vengeance? Or is it the Night Elves, who have watched the very sundering of Azeroth. You decide.
Personally, I find the Undead to be the most interesting race, even if I don't play them personally.