The Pershing came out literally at the end of the war according to this article (
https://www.thoughtco.com/world-war-ii-m26-pershing-2361329) 20 saw combat. Id say its influence was nil. I don't think you can say it was the best tank of the war, based on what? You can't base it on it combat record. Also it wasn't even a true heavy tank. Its design began as a medium and they just changed its class.
"The Pershing was originally designed as a medium tank, but at the end of 1944 it was reclassified as heavy to boost the confidence of the crews."
https://www.realhistoryonline.com/articles/m26-pershing-tank/
I disagree mostly with the comment about stats. Its true they don't tell the whole story but stats give you a solid baseline to start from. I agree the onus of advance was on the Allies and that weighs considerably in losses taken. As far as maintenance goes with German armor there were many versions each improving on the other for Panthers and Tigers. To say they all were so prone to breakdown and they were useless is not accurate. They were effective. Also as far as over all effectiveness of German armor in the west you must consider complete Allied air superiority. It is undeniable this had a mortal effect on the German war machine as a whole, especially armor.
It seems the basic arguments I've seen on this thread defending the M4 is comparable to the American WWII Grand Narrative, which is sort of the national propaganda that elevates American achievements in the war and diminishes its shortfalls. The claims are for the M4 reliability, comfort, false claim of armor superiority and they did not encounter German heavy tanks enough for there shortcomings to make a difference. All the while the claims ignore the shortcomings insufficient armor, lack of a serviceable gun and a tank doctrine that was mortally flawed, tanks don't engage tank, tank destroyers do and the fact that:
"Panthers, with which the allies first met at Anzio , began to be produced in large quantities. Tanks of this type made up half of the German tank power in Normandy"
"It soon became clear that the doctrine of using tank destroyers was wrong, and that the Sherman tanks could not fight the Panthers on equal terms."
https://www.realhistoryonline.com/articles/m26-pershing-tank/
I stated in previous posts why the M4 is under armored and still hold the opinion. As far as tank losses and crew losses as I just stated I gave evidence of this earlier, US 3rd Armored Div. a loss rate of 580% I mean how those losses equate to good crew protection is beyond me. I looked for a source of crew losses but I'd have to dig deep into the weeds to find that. Suffice to say this is true for all armor losses of all nationalities, some crew members survive.