The bigger the better. I can't always conceal a .45acp, 9mm, .40, .357 sig, etc. When I can't, I carry a .380 bodyguard in my front pocket. When you find the one and only one handgun to meet every need, let me know.
I have carried and seen individuals shot with a 9mm pistol (ball ammo), thanks to 20-years in the U.S. Army and 6 combat deployments, and the 9mm round seemed to be ineffective.
Ok, I'm confused (as usual). A 9mm isn't powerful enough so he chooses to carry a .380? I can see why people are questioning the OP's logic.
Personally, I hated my mouse gun. It was too small, terrible trigger, bad fit, not accurate and was the most uncomfortable gun I ever owned to shoot. I will agree that it was a joy to carry but that's where it ended. I had to force myself to put a couple mags through it on range trips and therefore I sold it to get a gun that I enjoyed shooting, was consistent with and was 100% confident that it would save my life if needed.
I see a lot of references to +P ammo. I know when I had my toy crackerjack Ruger LCP, they warned you never to use +P ammo in it. It was even printed in the manual.