I have favorite fighters and the order i have them in changes regularly.

Ali, Duran, Olivares, Gomez, Sanchez, Monzon, Leonard, Hearns, Pryor, Arguello, Mancini, Tapia,
70's Foreman, Frazier, Holmes, Foster, Nelson, Fenech, late 90's DLH, Mosley, RJJ, Tito, Cotto,
Tszyu, Hatton, PBF.
It's hard to judge the old school fighters without seeing a lot of footage, obviously from what i have seen of Sugar Ray Robinson on film he was outstanding.