boxing evolved alot between to period ov ali and tyson.
i would have to say tyson. and he would finish it early.
if ali tried the rope a dope or dancing like he did tyson would open up on him, he got caught out a few times by other "lesser boxers"
tysons downfall was drugs and women, when he was climing to the top he was focused and determined, but every time he got a belt he went sloppy, he training slipped and he would get beat down.
if ali and tyson met for an undisputed title fight. tyson all the way.
h was consistent (untill he had a title or 2)