To me, it is all about options. The chance of getting a 9mm (125 grn,) through a car door is minimal. A 357 (158 grn) penetrates better. Even a windshield can be iffy with a 9 para or 38 special.
I can hit a man-sized (half silhouette) at a hundred yards with a .357, about an eight inch drop. The .357 has nearly double the energy at a hundred yards.
You have to decide if the other options outweigh the magazine capacity of the 9mm.
Back in the day, I did what we called no BS tests on a lot of equipment. We didn't really trust what the manufacturer claimed and what actually happened.