WRT a .30 being less desirable, it likely boils down to the cost of ammunition if you don't reload for it. Personally, I'm a huge fan of the .30 Luger and own many pistols in that chambering. It's accurate, feeds reliably and loaded with a hollow point is a very wicked cartridge. I'm happy to pay less for a Luger in that caliber.
Back about 1989 I found an Erfurt Luger that had been reworked after WW1. It matched completely except for the replacement .30 caliber barrel. I gave it to my father who has since passed away and it's once again in my possession. I loaded some cartridges for him including ball and soft-nose hollow points. One Summer evening he and my brother were in the backyard sitting under a shade tree when my father saw a groundhog slowly coming their way and acting strangely. He handed the Erfurt to my brother and told him to dispose of it as they suspected it was rabid.
The first cartridge was ball and passed through without much effect. The second cartridge was a soft-nose hollow point and it turned the groundhog inside out.
For some years I used .223 cases to make .30 Luger cases and they worked fine but there's no reason to do that now. The cases are readily available and reloading them is as easy as any other pistol cartridge.
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