It all comes down to teh breeding. WS breeders are trying to breed for mroe of the old style with little to no angulation in the back. When Sheena stands naturally she has a very straight back. But when I stack her, depending on how far I move the leg back, her back comes down into the angulation. So it is not only breeding but also how they could be stacked or standing. Even stacked Sheena does not have the sever angulation of the GSD. Your best bet to understand the structure of WS and Berger's is to read their standards for structure.

I hope this answers your question.
Nicole