If I had to go with any, it would be the King Tiger...but for this topic, I must choose the Panther. Although the tiger is the classic panzer everyone thinks of, the Panther was a better combatant with sloped armor to make it harder to pentrate, a long high velocity cannon to penetrate armor better at long range (and to give it more range), and it was smaller and faster, allowing for greater mobility and therefore a more versatile tank. Add to that, its chassis was used for the Jagdpanther, one of the best tank hunters of all time.

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"If your gonna buy the angel s**t, you might as well go for the zombie package as well."
-George Carlin