Really the way I see it, the one who was being most strategic about it is the one that usually wins. Sure overwhelming power, but that means nothing when the enemy tricks you so hard into their own trap and just destroy you with it. Really battles are just to see who can out maneuver who. Cause if you coin toss the crap you would have someone like Harry (Just an example) win against someone like Indigo, despite the boy getting thrown around like a ragdoll.