I guess I need to justify my remarks for the T-34 and Tiger I. The T-34 was extremely well balanced in the three key design areas for tanks, namely speed, armor and firepower. Coupled with the production capacity of the Soviets, it was an incredible machine.
The Tiger I was revolutionary in its firepower range and its armor, but it wasn't designed for speed. Considering that the Germans only built a couple thousand Tigers, the Kill to loss ratio is outstanding. The Tiger could engage targets at twice the distance of their opponents and sustain hits that would have knocked out other tanks.
The Sherman tank deserves honorable mention, mainly because its speed and production numbers allowed it to be everywhere, all the time and be repaired and serviced with ease compared with the Tiger I.
The King Tiger really came too late in the war to do much good and its fuel economy and speed were its fatal flaws. True, if put in a good position it could annilate its opponents, but in the Battle of the Bulge, the King Tigers were simply too big and heavy to be really effective. Once many of them ran out of gas and ammo, they had to be spiked and abandoned.