One guy is a legendary HW champion. One guy is a not so legendary HW champion but has a 60 pound weight advantage. I go for Briggs in early ko. Who've you got?
I would say Briggs would have a bit of an easy time overpowering Fitzsimmons. Fitz was after all about 160-170. Completely different level of power here. Fitz is the better fighter but so was Ray Robinson against Marciano and I wouldn't pick Ray to win that one. Briggs by KO...EARLY.