Red team always won because:
Horses and jeeps take same amount of damage to kill, it seems.
Everyone gets a horse, which means the tank's main gun is pretty much pointless since no one ever bunches up.
Red can take blue vehicles
Unlimited ammo, insta-kill exploding arrows > Ammo using, full-magazine-to-kill assault rifles
There's always that one jackass who takes the tank (often the one with switchable weapons) for himself
In terms of base defense, cannons > those stuffty MGs