We get asked this question a lot. It’s important to remember only a select few fighters of the current era even make the all time great list. And they are ranked around the top 10-20 fighters of all time. That is where Manny Pacquiao and Mayweather would be in the all time rankings.
The greatest fighter ever undoubtedly is Sugar Ray Robinson. Now close seconds are Ali & Armstrong and the list goes on and on. You have the Sugar Ray Leonards, the Rocky Marciano’s, Joe Louis etc etc. Boxing has been around for over a century and their have been many great, great fighters during that time.
Sugar Ray Robinson tops most boxing pundits lists. And Ali is always high up there also. Some of the history sections on major boxing forums have some very intelligent fans who analyze history and create impressive lists.