Tyson by a long shot. Sluggers are more suited to mma vs boxers IMO. That's IF his hands could hold up with those smaller gloves. Tyson with mma gloves... YIKES! Shoot in for a double... get KTFO. (Apart from the phantom punch) Ali was never a one punch guy, and so I feel like eventually most mma fighters would be able to take him down over the course of a match and dominate there.