All time greatness is sometimes hard to define. Especially when it's a fighter who is not done yet.

What if Mayweather loses his next three fights. I know it is unlikely but what if it happends.

Before you tell me I'm crazy, Jones Jr was considered a boxing god before he lossed three in a row, two of which were by devastating knock out. Not to mention the two guys who beat him were not that great. Good but not nearly great. After that, many people began to question his greatness and his lack of competition throughout his career.

At the end I went with both. Simply because their careers and skill level are so similar, one can't be an ATG without the other, and it is just too hard to argue that they are not.