One difference is that Frazier was a one handed heavyweight. He had very poor coordination with his right hand. This is why you rarely see him throw two fisted combinations to an opponents head. Marciano could knock an opponent dead with either fist. Marciano also had a much more varied defense than Frazier. Joes bending forward at the waist style made his head a prime target. Marciano stooped to his right which took him low and away from larger opponents punches (similar to Dempsey in this regard). This video tells the tale:
https://*************/watch?v=q0cyYjsLtLc
https://*************/watch?v=q0cyYjsLtLc
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