Id say holyfield,2 weight undisputed champ. Lewis was very good I just think holyfield was a bit better.
I certainly WOULD say it was close! Lewis fought a whos who of fighters in the heavyweight division in the 90s and early 00's The only one he didnt fight was Bowe and Bowe ducked him. Holyfield(2) Ruddock Morrison Golota Bruno Tua Rahman(2) Klitshko Briggs Akinwande Tyson(even if he was past his best) Its a pretty exceptional record. Whether its better than Holyfield...debateble
If you put who they beat resume it is Lewis, but overall resume and the names on it then Holyfield. Who didn't Holyfield fight? Tua and the Klitchkos? That is all I can come up with.