It's a tradeoff between for-sure penetration and better capacity/control for me. I have a 12g if I want to put a large hole in something but I don't want to walk around with such a large gun. Punchier handgun rounds are mostly revolvers and kick like a motherfucker compared to the 10mm I've shot. That was only marginally heftier than my 9mm and I can accurately fire the 17 rounds in that as fast as I can pull the trigger while reloading it super quickly. If I'm shooting while panicked the more shots the better as I'm otherwise getting off three revolver shots at a moving target.