A silly example, but perhaps if you placed
100 of each tank, equal support, fuel, etc,
in a combat field, the German Mark 5 Panther would blow away either the Sherman or even the Pershing. In other words, in 1943 or 1944, the
U.S. had overwhelming superiority in production,
fuel, general supplies, and personnel. The tank
recovery crews in the U.S. Army were first rate.
The Germans could not compete in this area.
In 1944 or '45, I'm not too certain that longevity was a real concern to the German Wermacht. They produced a lot of vehicles, but not nearly enough, and with the lack of fuel and
trained, motivated people, they were doomed anyway. I am in no way a supporter of Nazism at all, but from what I've read, the German's had some very courageous people inside those tanks. Thanks for reading, John H Osterholm