Ali in his prime was when he was still cassius clay. some of those old fights its like art, how he moved ducked punches and threw with lightning speed. Eventhough he wasnt as big as tyson, the speed alone was knocking guys out. But Tyson at his prime, ala Micheal Spinks, with all the ducking, head movement, body work and power was boxing at its best. Its a shame there wasnt better competetion but look at old tyson stuff, just too much for anyone. It would be a good fight, but Ali at his prime wasnt a thinking mans fighter like he was in the rumble down under, he would of been ko'd.