Centipede doesn’t get a lot of mention, but it’s a pretty nice style. It grants a speed boost to attack with every hit, as long as you don’t get hit, and since it’s only attack is rapid strike you can punch a lot of zombies to death provided that you don’t get surrounded. Not getting surrounded is pretty easy enough to do, and straight lines of zombies usually fall before centipede.
One thing that may reduce damage is the fact that centipede is not compatible with the other martial art friendly weapons like brass knuckles and punch daggers, so it might be reliant on strength to do damage. Still, it’s fast, and even at the start it can wipe out a group of zombies if you can make sure you don’t get surrounded by them.