Alliance, because who wants to join a bunch of genocidal chickens who don't even have the guts to own their horrific deeds an come judgement day all go pussy and scapegoat their leader.
I hate Anduin and I dutyfully go to the throne room and /spit on him everytime I pass by Stormwind. As a die hard nelf fan, I don't see that the Alliance is much worth to the nelves.
Alliance is the lesser of two evils. And the music is better, so are their main cities, artistically speaking.