Going with madara. kishi stated he's perfect with no weakness whatsoever and is so powerful he couldn't figure out how to kill him off (explains the bogus BZ betrayal stab), then decided to amplify madara even more as a host of the juubi, released the full power of rinnegan, uses limbo, absorbed the tree and unlocks rinne-sharingan. so even if juubito managed to use kamui (can't use intangible), i'd still say madara will find some way to beat obito. it's insane how much madara managed to overcome stuff that would be certain death and yet he still remain top dog with a smile on his face.
