I wouldn't like to bet on this one,but if pressed I'd probably opt for an Ali sitting down on his punches.
This shouldn’t even be a question. Ali is under appreciated with his power. That being said I read the other forum you were referencing and maybe the poster meant stronger in the clinches? Which I wouldn’t believe either but Charles was no slouch in that department.
How many iron chinned guys like foreman or Bonavena did Charles stop? I love Charles but how is this a serious question?
He dropped, rocked and stopped a few tough guys at 175. Bivins and Moore being the main shouts. His KOs over Marshall, Smith and Ray aren't something to s****** at either. Ali's KO over Foreman wasn't due to his power either, it was an extremely smart gameplan combined with Foreman's own fatigue. Although I agree in an actual sense, Ali definitely hit harder.