Late arriving here, but I agree on your choice. The PM is much flatter and easier to conceal as others have noted. I have a P9 and it is my main carry in warmer months. It just vanishes in a good holster, such as the Crossbreed Super-tuck. Flat and quite smooth. Mags are flat too, so it is easier to carry a couple in your pocket. Don't get me wrong, I love XDs and have two but mine are full-sized. For CCW when I really want optimal concealment I always drop to a single-stacked pistol.
John