I don't know why so many put the 9mm down. Personally, I have nothing chambered for it, thus I don't use it, but I certainly would not want to take one (or 15) to the chest with it.

My carry platform is 12 rounds of 357- 7 in a 686, 5 in an M&P 340. I sometimes wonder about getting something that carries more rounds, but revolvers are what I "know" and shoot best, so I stick with them.