I started off as Alliance, and prefer them greatly over Horde. I like how they are united in so many awesome things, rather than the Horde whos (lorewise) united against a mutual enemy. However, on private servers, more often than not, 85% or more of the Alliance players are pure garbage. So I always end up playing Horde, even tho I start as Alliance. Especially in PvP my experience is that Alliance simply doesn't cut it. I like a challenge, but losing 4 out of 5 battle isn't fun.