I do find the pamzerwerfer a little op as it deals excellent damage in a single salvo.
I can see what Cultist is saying however, the katyusha fires four rockets per salvo while the panzerwerfer fires ten.
My point is that with the katyusha you will only have a good effect with one salvo unless your player is a scrub lord and does not retreat/move.
I know its closer to risk and reward but the panzerwerfer wins in this case (when firing close to their target).
It really depends on how you see the role on both Katy and Werfer.
If we speak about braking the enemy line, then Katy is much better, because of its scatter as we already said, and longer barrage. Katy usually able to hit multiple targets spread around front line, and there is no way you can escape rocket, without retreating all your force or relocating them. Not always, but usually.
PW on the other hand is dealy for blobs, its annihilates them, better then katy, but besides that PW is not much better then Katy. Yes, it has 10 rockets per salvo, but they are aether drop on the middle of the circle (if you shoot close to target) which means that everything in circle will be wiped with first few rockets so more rockes per salvo don't make much more difference. Or, if you use it at long\med, distance even 10 rockets wont do much usually.
Different units, I may say. Both pretty dem effective and wipe everything in a blink of the eye if used close to target, PW simply is slightly better at this role, while katy is better at breaking enemy line.
Pinning and suppression are slightly OP, so we can get rid of it. But effectivness should stay as it is, because Ost don't have any proper tools to fight against blobs and destroy them, besides werfer.