The problem in comparing these stars is that they will never compete, and there is truthfully no way to determine exactly who was best. He was smaller, slower, less agile, and had a decided disadvantage in reach. A computer programmed with the extensive ring history of both fighters agreed with Moore. And experts point out that Rocky never lost a fight while mixing it up with the likes of the great Joe Louis, Joe Walcott and many others. Ali of course lost five.
Baseball has it controversies as well.
We will never know, but we do know that Ruth hit softer baseballs made of inferior materials than Aaron. When struck with the same force those balls did not travel as far. And the parks he hit from were on average much larger. In Aaron's camp are the detractors that point out relief pitching in the modern era was far superior to the pitching Ruth faced, and the late inning blasts of the Babe simply wouldn't have happened as often in the 1970's. Perhaps the most telling facet of this discussion though is times at bat.