I voted Ali Frazier. Although other trilogies may have had more action this was a trilogy that featured two of the biggest stars ever to lace a pair of gloves.

They just don't come bigger than Ali and Frazier and that reason it has to be number 1 in my mind.

I can certainly except some people thinking Marquez Vazquez had even better action but let's be real, that trilogy probably attracted maybe a dozen casual viewers worldwide, it was a hardcore fans trilogy.

Barely nobody outside of boxing circles, and certainly outside the US would have even known they took place. Whereas even my mom has a dim recollection of the names of Ali and Frazier.