How come the less clothes you wear the more powerful you get? For example; girls only wearing a towel can punch guys half a block away, or Goku can only win a battle after most of his clothes are ripped.
This may end as a stalemate. They have no means to destroy each other and have incredible regeneration abilities. Buu may have the edge because if Doomsday can be turned into chocolate, then Buu can absorb him an become unstoppable.