I started playing this game due to the lore behind all of it. I played Warcraft 3 RoC and TFT and was absolutely moved by the story behind it...
Seeing how humans were and still are my favorite race in WC3, I think it would be fair to play such race in WoW. Most of my toons are humans even WAY before we got Every Man for Himself
Paladin it being so imba in the game itself (Divine Shield > Heal = GG)
After playing both factions during the game I sided with the Alliance due to them being more "civilized" and better looking whereas Tauren, Orcs and Trolls look very tribe-ish and I'm a sucker for aesthetics.
How about you fellow champions? To keep it more fun, try using the same format!