Yep. It would seem like all the good alliance pvpers get frustrated and roll horde. The only thing I can say about the 2 in pvp is on average horde plays more heals in bgs. Alliance seem to have lots of druids and priests but they are almost all DPS and not heals.

It's hard to feel that way as a goblin.

Actually, I always felt that the Alliance was the underdog. For some reason it seems that a lot of people portrait the Horde as the "cool" faction lately, and in my experience I just met a lot more people who were faction pride obsessed (aka jerks) on the Horde then the Alliance. But then again thats just my own experience.

That's exactly how I feel! I always take the 'outcasts' in games, because they seem like more fun to play and less standard. But ofc that's all lore.
And as for the players behind them, it's way to hard to compare, you've gotta level toons from 1-85 on multiple servers, all in a very short time, because there's also things like 'people becoming asses in a certain expansion or patch' etc. And do same amount of PvP and PvE. And still you might miss the right guilds on one server or only log in during bitching mornings on the other.
And I'm waaay to biased, because I love the Horde!