The pack howitzer might be able to kill something at vet2. At vet0/1 I'd rather have the leig because it has lower scatter so it actually hits.
But the deciding thing here is that the pack howitzer gets oneshot by the stuka zu fuss, including the gun even if it was full health about half the time. It also costs 40mp per man to reinforce because relic is a bunch of trolls. The risk of losing the pack howitzer is an order of magnitude higher than the risk of losing a leig.
So, buff them both / reduce both costs?
They can do good damage sometimes but gnerally both play a small role. I rarely build either anymore.
I'd like to see lower damage but wider splash. 'Cos dem blobs, dey be comin'.