@suprise:
How about oil and gasoline….or the radio
these where the 2 main things to concider in tank warfare
many agree that the T34 is the best tank of th war, it was cheaper, easier to operate and stronger than most german tanks. (leaving out the panther and tiger)
then how did the germans manage to beat them with tanks that where inferior on paper? Better radios. The radio almost nullified the advantage of the T34, it gave better coordination inside the units and made it easier to call in close airsupport, and in tankbattles nothing is more important.
Well, perhaps gasoline, the russians where able to build huge quantities of tanks, while not worrying about gasoline efficency. your tank and planes cannot fly without it.
I have heard stories of 20k+ german fighters being found, unused after the war, simply bc they missed the gasoline to fly them (have not verified it tho, so it is hear say at this point)