I have a 9mm Kahr MK9 and a Smith J-frame, Mod 60 snubby in .357 mag.
The Kahr is 6+1, and I have an extended mag for a larger Kahr which is 8 rd. I think.
Smith is 5 rd. BUT it's .357 mag.
Both about the same size/weight. But the revolver offers a lot more muzzle energy. I've never had a "failure to feed" or "stovepipe" in a revolver, and I can leave it loaded and not worry about compressing mag springs (Although many claim mag spring compression is not an issue.)
I lean toward the Smith, feeling pretty much that one shot from a .357 is a show stopper.