Board Thread:Versus Debates/@comment-26388300-20160331052018/@comment-734582-20160331090612

Although Sasuke doesn't have Sage Mode and thus can't really harm him, like Madara Sasuke can simply steal some from Obito.

Sasuke has a true rinnegan (rather than Obito's transplanted) so his control over it would be superior. Obito can't phase while possessing the Juubi.