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.
The Chieftain is an Irish-born, U.S. Army reserve armor officer. He maintains that overall the M-4 Sherman was the best tank of World War II. He bases that assessment on logistics (most reliable and most easily maintained), speed, mobility (hill climbing in mud), firepower and protection. Check it out:
https://www.youtube.com/watch?v=bNjp_4jY8pY