Light tank Stuart
Med tank Panther hands down
Heavy tank Tiger 1 Tiger 2 JS 2
SP Gun STUG 4 /SU 152
Tank destroyer Panzer Jagd 4 Knockedout the most amount of tanks in History cheap to build perfect for a defensive war.
But it is a very hard if not Impossible subject to finalise. The T 34 was produced in massed Quantity with 50000 built and around 40000 knocked out. It was reliable cheaper to build but suffered greatly to the 76/ 88 and 128 mm german guns. As with the Sherman origanly could be destroyed with HE shells due to unseccured ammo stowages. For performance the Panther was the best tank of the war hands down and the Tiger not to far behind. with only 10% of Tiger 1 knocked out by Allied tanks and AT guns the rest by air or break downs. The ratio of Tigers knocked out to tanks destroyed was 8:1 the highest in history. It is belived that if break downs and those knocked out from the air are Substracted the figure was up to 40:1 pretty good. But to look at the basics they didn't stop what was coming at them so in Military terms they where a failure, which means the most successful tanks of WW2 was the Sherman (tommy cookers) or the T34 strenght in numbers. the two highest loses of classes of tanks in history.