So you build pzgrens because grens are a mp sink in your opinion? Well that's a risky theory as pzgrens are exactly the definition of mp sink in ostheer faction. They are good but situational, work only if in green cover before fight or enemy doesnt focus fire them. More than one squad is madness. On the other hand grens are much cheaper and have faust + rifle nade + same dps on long range with lmg. Whats more their damage doesnt drop as fast while they loose models. 2 model pgren squad is useless, 2 model gren squad can still deal a lot of damage.
Another thing is that if using harder to hit bulletins,pzgrens at VET 2 get (-29% + -20% RE) -more than double the meagre -23% RE of a gren squad at VET 3.So in terms of model survivability pzgrens can stand upto to vetted rifles much better.And pzgrens do almost same dmg at long raneg as lmg grens,also if u charge pzgrens like u can LMG grens u'll likely get shredded(especially rifle flamers/commandoes),and they can attack on the move -being assault troops which grens are bad at -grens are horrible at meeting engagement and in constricted terrain.
If a osttruppen commander had tiger -you wouldn't see grens again.