if you are talking about in their prime, let me see, Fedor fought most UFC belt holders (once the contracts expired) and the fights were all one sided. this included Tim Silva, Arlovski, Nogueira, Coleman. As for Cain being a bigger fighter, watch Fedor vs Hong-man (a giant Korean MT fighter). I cannot remember if it was Couture or Rutten who said that Fedor had the hardest punch in MMA
Ouuu thaat's a tough one, but I'd say Cain by decision.
Standing up, cain may be a little bit better in the boxing category, but Fedor has the KO power and can take a lot of shots.
Wrestling, Cain has a better wrestling game and I don't see Fedor being able to stop it. Fedor has good submissions, but Cain is so active, aggressive, relentless, and great at controlling his opponents that I don't see Fedor being able to get back up.
It'd be a hell of a fight though, no doubt about that.
Cain is a lot bigger. Fedor is arguably not a true heavyweight and should perhaps have fought at LHW. I'd say Cain would win, but I think Fedor is the better fighter. If they were the same size, I would pick Fedor.
Cain is the better striker but Fedor has the superior grappling
