I have a PM9, and have owned, fired or carried some of the others, including j-frames of steel, aluminum and Scandium.
The PM9 is significantly shorter than a j-frame front-to rear and as such is easier to conceal in any normal pocket. (IMHO)
I am attempting to attach a pic, but generally don't have much luck with that. Oh well, here goes nothin'.
pocket carry is an accident waiting to happen