As you know delcyros its not only how hard the armor is which matters, and USSR armor tended to be too hard and brittle for most of the war.
The tank with the absolute best armor of WWII is the Tiger Ausf.E with its 255 - 260 BHN RHA armor of very high quality.
The tank with the absolute best armor of WWII is the Tiger Ausf.E with its 255 - 260 BHN RHA armor of very high quality.