Ali's era was the most exiting in Heavyweight history, Foreman knocked out Frazier and Norton, Ali knocked out Foreman, Frazier beat Ali, Norton beat Ali, Young beat Foreman, Holmes beat Norton and Ali. Liston beat Patterson and Ali beat Liston. Ali was the most outspoken and loudest, and drew more media attention than anyone else but again the best I question it. Foreman fought over 28 years and lost the same amount of fights as Ali, Holmes went 48-0, I think a list of the top 5 can be made but no one can argue that a certain fighter can be labeled as the best. Johnson was the greatest of his era, Marciano of his, Louis of his, Ali of his, Holmes of his and Tyson of his. The argument can go on forever.... In Ali's era you could say it was the best batch of talent, or you could say there was a lot of well matched great fighters, depending on their styles they beat each other and created the most memorable entertainment. Regarding the comment of anyone doubting Ali being the best doesn't know anything about boxing, is just ignorant.