I'll go with Prince.
Michael is one of the greatest performers of all time, people still copy his moves. But Prince, in my opinion, is the better musician. When it comes to his music, he does it all; writes, sings, plays most (if not all) of the instruments, produces for other artists, etc. And it's like performs damn near everyday, they say he actually has a club in his house.
The only thing about him is that he's REALLY overprotected about his music and where it goes.
But I'm hoping that one day these two can make a song together, that would be a sure fire hit.