Joe Louis, that's what my father told me. He thought he could beat Ali.
It's just so hard to compare athletes from different eras. Even in baseball, Babe Ruth would likely not even get a try-out on a team today. Could you imagine him doing a 40 yard dash? Yet he is considered one of the best baseball players ever., at least in his time.
In NBA basketball, Wilt Chamberlain once scored 100 points in one game (and no 3 point shots like we have today). Yes, he was about 7 feet tall and everyone else was about a foot shorter at that time. Today, there is nothing exceptional about being 7 feet tall.
It is an interesting debate over a few brews.
Rub a Dub