My money and of course my heart would be on Ali. Young Ali with his height, lightining reflexes, the jabs, footwork, finishing power when he had you hurt, and unfortunately for him in later life the ability to take a big punch. And the head games and "conversations" with Mike in the clinches.
Then again…. hard as Smokin Joe hit, Iron Mike hit harder and was fast as well. But very short. I worked a high end wedding around 6 years ago with 2 other camera persons where Mike was the best man (go figure??) for "Mean Jeff Greene". Was at this mansion in Beverly Hills up in a box canyon where he owned it and the whole box canyon. https://www.google.com/search?client=sa ... 8&oe=UTF-8
My personal theory was that when Greene was at Harvard business school he was already amassing his first mega millions in real estate transactions. This was around the time when Mike was in his prime and maybe they met, and Mike was bank rolling Greene's business ventures. Greene says they met in Malibu around 20 years ago.