How would we know? Wilder has had half a decade to take on a Joshua or even a Pulev/Povetkin or anyone top shelf in their prime. Pointless including Wilder or even Fury/Joshua in any ATG talk. They never fight the best of their division (unless they're old and well past their prime years). Ali wins by default ... Wilder ducks him. Let's face it ... so far that's the most realistic outcome. Usual reasons ... can't agree on $$, venue, day, etc.
and they want to compare that level of skill and execution to the guys you see today. thats a HW doing what youre seeing. theres been a lot of talk about haney, and his inability to put mustard on his shots. take a look at the series of punches ali throws starting at 5:37. he throws a bunch of hard punches to get him off balance and open, and then loads up on the last 2 punches. you can see how he cocks his left arm for that hook. faster than he had been throwing those other punches. most people dont see stuff like that, so cant appreciate the differences in a really well schooled fighter, and one whos opponents make him look well schooled.
As my Grandfather used to say in some of these fantasy match ups involving Muhammad Ali: "If this fight ever takes place, bet the farm on Muhammad Ali, and your vehicles, and your furniture, and your jewels, and your investments, and the clothes in your closets and drawers and on your back."
Ali clowns him at all the press conferences leading up to the fight. Ali clowns him at the weigh in. Ali clowns him when they touch gloves. Ali clowns him throughout the fight. Ali clowns him for Howard Cosell interview on ABC Wide World Of Sports. Ali clowns him 10 years later on Johnny Carson.