WRT the quest disparity... I've been checking this site and thottbot for quests, and over the past few patches they've added quite a few to the horde side. Don't know what they've done for the Alliance, but I saw stuff for, say, Thousand Needles that was NOT in the game during stress test. Blizzard is working to remedy the situation. And a bunch of the stuff added was for the mid-to-high 20s, so between there and Stonetalon there should be an alternative to Hillsbrad. Heck, I think they're working on some Stonetalon stuff (though don't quote me); the entire Lake area in the middle of the zone needs more stuff to do.
Anyway, the Alliance's biggest advantage in PvP is numbers, and going to the Alliance because you're afraid of numbers just makes the situation worse.