I agree re the Cleveland Williams fight being his best performance, however although he was fairly young when he lost to Frazier and Norton he just was never quite the same after those 3 years out.
Has to be Ali for me. Was a stunning, classy looking fighter but to go against the government and condemn the vietnam war. He was threatened to be shot in the ring on many occasions and still performed. I also believe we missed his best years when he was stripped of his title and not allowed to...