Front for me. But i carry everything up front. I like IWB strongside front, but now with a bit cooler weather, I keep an xd40 iwb, and an lcp in a nemesis pocket holster. Its handy
I recently got an lcp for summer carry & tried the front pocket without a holster. I don't like the way it tends to turn upside down, so I'm shopping around for a pocket holster.
I just drop either my S & W Model 637 Airweight .38 snub or my Ruger LCP .380 in my right front pocket. If its winter and I am wearing a coat, I often have both. One in the pants pocket and the other in the right coat pocket.
I like the ability to have the gun in my hand in my pocket instantly available without anyone knowing.
Rear left pocket only,mainly since its the only pocket i dont have crap in and its accessible to my left (weak) side arm.I carry this as a bug so it its position is perfect.