The PPS is a purpose built CCW pistol that is a single stack, very thin and a maximum capacity of 9 rounds with the longest mag. Mags for the PPS come in 6,7 and 8 rounds while the PPQ is a double stack which allows for higher capacity magazines.
The PPS shoots well for a pistol that also carries as well as it does. The PPS trigger is comparable to a Glock trigger if not slightly better in stock form.
+1 on the PPS, and it shoots (recoil) like a much larger gun, allowing all day at range with no fatigue. 1 of the things i feel is critical for carrying, willingness to put in practice/training/range time with your carry piece and seems to be lacking with most known friends and assoc that carry, and that I rarely hear promoted from others on boards that carry.....
The PPQ and VP9 fit me far better (thus better grip and control) than any others pistol Ibe used, best natural point of aim (for me) and triggers, ease and accuracy of follow up shots, and as much as I disliked the lever release at first (because of previous training with button release systems) I came to realize that the lever release is a better system and took little real effort to retrain to it.....also all controls can be manipulated without changing my grip or losing sight picture....
I originally was trained on Sigs, and also have experience with CZs, (and which i think are very good as well as Glocks and some others) but I am no fanboy (or basher) of any make or brand, they are just tools.....and I just want to find/use the most durable, reliable and accurate tools I can within reason price wise, to conduct my trade.....so to speak......also I don't let availability of mags or accessories dictate the foundation of what I use (which seems to be too common a condition in choosing), in this day and age you can find anything if you really want to.....but this is all just my opinion about what works for me.