Both can be true. Horde may have slight objective advantages in racials and map layout, and they may also be more likely to engage more meaningfully in AV if they know it will be two hours before they get to try again.
Alliance won a lot when they were playing as coordinated 40 man raids with a common goal, so clearly effort/motivation to win can overcome whatever perceived implicit advantages horde has in AV.
You’re right. Its widely known that AV has an Alliance bias. Its a fact. As well as Alliance having the better racials for group PvP. Complete undeniable facts.
That’s an oversimplification of your original point. Horde tries harder because they have longer queues, therefore horde have more success because they try harder. Like I said already, this same fact was true when alliance was rolling 40 man premades of common goal try hards. They were trying even harder still, and so they won more frequently.
Point acknowledged that I shouldn’t have said fact. All available evidence supports the notion that effort corresponds to success, for either faction. Sorry I don’t have blinded controlled studies and data for peer review, but it is just a damn video game.