The fundamental issue for OKW vis a vis shreks is that they are a crutch because OKW lacks plentiful mobile AT. The Rackten is the least durable AT gun with less pen than a ZiS.
ffs people, look up the damn pen values on AT guns and memorize them.
pak
210.0/200.0/190.0
rak
200.0/190.0/180.0
zis
200.0/190.0/180.0
57mm
140.0/125.0/115.0
there is no significant difference between the pak, rak, and zis but the 57mm has shit pen.
also for reference...
schreck
180.0/170.0/160.0
ptrs
100.0/85.0/70.0
bazooka
130.0/120.0/110.0