BoxRec

The prime, quick handed, textbook boxer/puncher, the very hard punching terrific knockout artist. trained by the legendary Jack Blackburn, The Brown Bomber JOE LOUIS, who in getting revenge beat the hell out of the fine ex. champ, Max Schmeling in one round in Yankee Stadium in June, 1938.
(with Adolph Hitler and President F.D. Roosevelt listening to the live fight call on radio)
vs.
The prime, super quick handed and fleet footed brilliant boxer, marvelously talented, very tough warrior trained by the legendary Angelo Dundee, The Greatest MUHAMMAD ALI, who dazzles viewers when he stops Cleveland Williams in the Houston Astrodome in Texas in November, 1966.

Who wins?

If I had to bet, I'd take Ali by decision. What a great mythical fight !

Ali would win due to his superior agility and faster hands. Although he would be better to box from the outside for all time.

Ali possibly by late stoppage. Ali scored his KOs often against guys who pressed the action. Louis would press the action.