Name the guys that had the most firepower in both hands in the history of HW division, i.e. biggest combined tonnage of power from his best right hand punch and left hand punch. Fighters that definitely won't make the list because one of their hands was much weaker power-wise than another one: Shavers, Wilder, Lennox, AJ (harder left hook than 3 previously mentioned fighters but still not comparable to his right hand), Brewster, Sanders. Tua, however, would make the list because while his right hand was far from perfect technically it still contained devastating power. The same goes to Tommy Morrison. But I think the best two-handed punchers are among those men who had both excellent technique and power in both hands - Joe Louis, Sonny Liston, George Foreman, Mike Tyson, Wladimir Klitschko and Zhilei Zhang. Each of those men could take you out with either hand. Out of this group I think Wlad and Zhang had the most devastating combined raw power in both hands. However, it was George Foreman who held the widest arsenal of devastating punches of them all - right hook, straight right hand, right uppercut, left hook and left uppercut. What is your ranking?
Liston Foreman Wlad Tyson Louis Dempsey (maybe a little bit less than the guys above due to him being light in weight, but still ....) Shavers I agree with Zhang being up there as well though he only has a couple of notable stoppages. But he does have a strong left and and excellent right hook.
Foreman and Wlad The double-triple left hook from Wlad that sent Ray Austin down was a revelation to me for his versatility and true KO ability
Come on it’s Joe Louis easy! - if you mean raw power it could be freakin anybody, probably Shavers, Wlad or Brewster? Maybe Sanders? Maybe Foreman? Or Tyson? Heck could be Oliver McCall who knows it’s all circumstantial guess work they all hit hard but the guys who hit hard and did it the best was Louis, Dempsey, Marciano, Wlad, Lennox and Tyson by quite a bit lol it’s entirely possible Ali hit the hardest he busted up durable guys pretty bad but his style would never let him get KO’s the way Liston did.
I'd back George Foreman, Mike Tyson and Sonny Liston in no particular order in having overall the hardest left and right hands in boxing.