I think you have to boil it down by looking at who had a lot of one-punch knockouts or knockouts where one punch did all the damage and whatever else came after was just icing. Also, who left them out cold completely. Julian Jackson had guys out before they hit the ground, just timmmbbbbbeeerrrrr. I lean toward the Hawk as hardest p4p puncher of all time. Haters gonna hate, but Deontay Wilder has done that more often than most of the atg heavyweight punchers. I think he’s in the mix.
Well the finishers when he beat Sharkey and Ruhlin in quick succession we’re head shots. He knocked Sharkey cold and some thought he’d actually killed Ruhlin.
In regards to Wilder, Eric Butter Bean Lasch had over 50 Ko''s almost 20 More than Wilder. So he also should be highly regarded as far as punchers are concerned since he has more KO's than Wilder. Or was it because the competition he faced was so weak? Just like Wilder?
I like punchers who are proven against guys who were almost impossible to stop. Hearns had some very impressive stoppages with two or three clean shots against Cuevas and Duran, same with Foster over Tiger and Quarry. J.Jackson had classic ko's of tough as nails B.Drayton, and Graham. Shavers damn near decapitation of Holmes, and Ali though he lost to both and the knock out streaks he had against legit competition is very impressive. Same with Foreman (Frazier) and Tyson (Berbick and Holmes though Holmes was beyond prime. At the lighter weights Alexis Arguello, W.Gomez, C.Zarate, R.Olivevares , and Sandy Saddler, had some great knock outs against tough competition. But I'd say the fighter with the most eye popping knock outs is ,,,,,,,,,,,,,,,,,,,, J.Jackson.