Prime George Foreman vs. Prime Joe Louis.

Yes there is, cause he fought in a weak era

 

As opposed to Foreman's era where a 7-fight Leon Spinks was able to became undisputed heavyweight champion....

and Chuck Wepner, Richard Dunn, etc received title shots

 

same thing I always say but you say it in a nice way I just say it was trash
a bigger target like Louis fought anybody like George which he never did

 

Champions who are consistently beating the best over ten years are very rare, however strong or weak the era is.