If you really want to do well with AOE then you should probably go Fury for it. Cleave/WW does atrocious damage, maybe it gets better as our gear scales/we get the legendary belt, but atm it's pure trash unless you're on like 15+ mobs.
I do Fury on trash/AOE fights and Arms on ST. My first trash pull though I go arms because I can do like 1m DPS with Bladestorm + Battle Cry + Warbreaker :P.