Alan Fud,
I agree, both the PM9 and Pocket 9 are pretty close in size. The Pocket 9 is a little slimmer and more rounded in the slide which makes it feel smaller. The chunky rubber grips are thicker on the Pocket 9 compared to the PM9's polymer frame, but some custom thin grips would fix that. To my hand, the Pocket 9 feels marginally smaller and comfortable in the pocket, but it's a close call. Given the spotty reliability of my speciment, however, I would only carry the PM9 for defense.