This to me is very hard to say cus my answer can change anyday, but I might say Shogun/Hendo 1 is my favorite fight, but if it was a fight that was a 3 rounder, then Griffin/Bonnar for me. There's so many honorable mentions for me like Chuck/Wandy or Bigfoot/Hunt etc.
so many great fights its hard to pick one Hendo/Shogun 1 Fedor/Crocop Hughes/Trigg 2 Hunt/Bigfoot Nog/Sapp Frye/Akiyama Jones/Gus idk probly many more but i cant just pick one
True, I think you have to categorize them to be more fair. Like 3 round fights, title fights, 5 round non title fights, etc.