Yeah but I am talking from the 1v1-2v2 perspective
There are 36 maps in the 1v1 + 2v2 rotation. Out of those 36 maps I regard 6 maps as clearly Jagdtiger beneficial: Minsk, Rails and Metal, Kharkov, Crossing in the Woods, Rzhev and Across the Rhine. I´ve not enough knowledge about the custom maps to judge them. However 6 out of 36 is still not 90%.