I also reload and tend to tune my loads to the handgun. At least, I did when powder was available. Now that it's not, I average my loads among several 30 Luger handguns.
I have Luger, Star BM, Colt Gov't Model, Lahti. Nambu, and a couple other 30 Luger chambered handguns. As mentioned, the 30 Luger/7.65mm Parabellum has less recoil, was the cartridge the Luger was designed for, and does seem to feed more reliably than 9mm.
The 30 Luger [the pistol] also seems to have a generally lesser price than the 9mm.
