I carry my PPS 9mm in a Crossbreed Supertuck (IWB). It's very comfortable and I hardly notice it's there. The thinness does not equate to discomfort when shooting. They make 6, 7, and 8 round magazines for 9mm. I carry it with the 7 round mag and an 8 round in the pocket.
I also like the mag release under the trigger guard and the firing pin that protrudes as the trigger is pulled. You can place your thumb on the pin when reholstering and would feel if the trigger got snagged and started to be pulled. It also acts as a chamber indicator. It sits flush with the back of the slide when a round is chambered and is painted red for easy recognition.
It is also very accurate with all Walmart FMJ ammo I've fed it.
My 9mm PPS has also been reliable. I use a Theis IWB holster or a modified DeSantis Nemesis for pocket carry, 124 grain Gold Dot +P Short Barrel for ammo. The Gold Dots are really great, very little muzzle flash compared with Winchester White Box practice ammo.
I think if I was shopping today I'd look really hard at the Ruger LC9s, I wish I had some experience with one.