The best concealed carry handgun is the one (or more) that you'll carry every day. In my case it's a Kel-Tec P-11, 9 mm. And most days that's complimented with a Para-USA 1911 GI Expert. (No worries, my rotunditude could damn near conceal a Ma Deuce)
Like m58 and his LCP, my P-11 is VERY easy to conceal when entering places where personal responsibility is frowned upon.
Remember, two is one, one is none. And in a serious social interaction, why reload when you can just go to your other gun?