When is it viable to compare fighters from different era's
Hello fellow posters.
I was wondering what criteria is required to compare fighters from different era's.
For example the great trainer ray arcel saw fighters from the late 1910's until the early eighties and his faculties were still intact as he was working the corners of world title bouts so if I asked him to compare benny leonard to roberto duran he could easily do so.
Please feel free to post your thoughts.