Power Attack, then Cleave.
I play a lot of melee types, and I find that in the lower levels I use a lot of different weapons, and specializing in just one of them usually isn't an option. I've gone from smashing skeletons with a warhammer to cleaving through zombies with an axe often enough that I wouldn't want to tie myself to one weapon, and Cleave and Power Attack both work no matter what you're smacking.
I play a lot of melee types, and I find that in the lower levels I use a lot of different weapons, and specializing in just one of them usually isn't an option. I've gone from smashing skeletons with a warhammer to cleaving through zombies with an axe often enough that I wouldn't want to tie myself to one weapon, and Cleave and Power Attack both work no matter what you're smacking.