The younger Cassius Clay/Ali champion (1964-1967) surely beats both of them? Larry Holmes (1978) (The version that beat Shavers and Norton) can go the full 15 rounds so might have the edge over the Pepe Correa trained faster flat top Lennox Lewis (1991-1993) but struggles against the stronger Emmaunel Stewart trained dreads Lewis (1997-2002). I can see a case for both for Holmes (1978) and Lewis (97-02) potentially taking a fair points decision against the slower second older seasoned championship best version of Muhammad Ali (1974-1978) on points but neither man would likely knock him out or win by stoppage.