The American Shermans were faster to build, but nowhere near the engineering perfection of the German. But the speed at which they could be built or repaired and the volumes just knocked out the tigers.
Similarly the Russian ones were crude, but quickly built
They may have been works of art, but the German tanks ran on gasoline instead of diesel which did cause a lot of problems. Reliability was abysmal, and the Tigers and Panthers were prone to overheating and spontaneous fires.
Russian tanks were the best period. Sloped armor was their secret.
American: I still don't understand how you guys lost. The German tanks had a kill ratio over ours, of 10-1.
German: Yeah, but you built so d@mn many of them, you always showed up with 11 !
Except for the part where they leaked fuel inside the tank, were mechanically unreliable, and difficult to work on. But in the field, we lost 3 Shermans to every kraut tank. So there was that in their favor.
That aside, concerning Stalin's apology, etc. If that lunatic had not signed the non aggression pact with that other lunatic in the first place, this whole discussion maybe would not have taken place.
Zhukov in his memoirs, stated he didn’t like the American lend-lease tanks. They would not start in the cold weather.