I'd also like to add that I like playing Alliance because I'm one of those people who when I first heard about WoW clearly considered the Horde the "bad guys" because I played a bit of Warcraft 1 and 2, and I've been a huge fan of traditional fantasy tropes since I could read pretty much; in most D&D and traditional fantasy genres the Orcs/Trolls and the like are evil marauders. There are now exceptions to that of course but "traditional" fantasy has that mindset and I've played traditional fantasy for so long that I almost immediately chose Alliance based on the perception of them being the "good" team. Now I mostly play Alliance because I have more friends on Alliance side than Horde, so it's a matter of convenience.