CS9 & PPS
I have the CS9 and the PPS in 9mm. I like both and here's my take on the two.
The CS9 is a great little gun. It is a traditional DA trigger setup (especially nice if you're looking for second strike capability) and both DA and SA pull are very good right out of the box. Sights are traditional three dot and are easy to acquire. All external controls are very ease to reach. Grips on the CS9 are rubber Hogues and give a very positive grip (although they make the gun a bit chunkier). Accuracy of my CS9 is very respectable. Recoil on the CS9 is very manageable, which should make your follow up shots a bit quicker. While my CS9 will digest any factory ammo I give it, it sometimes will FTF with cheapo target ammo.
I find the PPS to be a love/hate relationship. When it's good, it's very good - and when it's bad, it's a b****. The good about the PPS is the size. It's extremely slim. All the external controls are very low profile and (as mentioned by another member here) the ambidextrous mag release is integrated into the trigger guard. Since the frame of the PPS is polymer, the grip is also very thin. The grip texture is a series of little nubs. I personally prefer a more positive grip texture so I opted to add a Hogue slip on grip. You can further change the grip shape by changing out the backstrap for a different size one. And if you need some more grip length, 7 and 8 round mags are available with grip extensions. All in all the size and weight of the PPS make it a good choice for CCW - you can even pocket carry it. The sights on the PPS are typical three dot setup and are very easy to pick up. Accuracy with the PPS is very good. I find I can shoot tighter groups and hit targets out much farther than I can with my CS9. My PPS will also shoot whatever I feed through it - even cheapo range ammo.
As for the bad in the PPS, it's the trigger. It is very heavy (worse if you have a MA compliant version) and a bit gritty out of the box. Although it does get a better with good cleaning/lubing and lots of dry fire practice. The trigger itself is also uncomfortable (at least in my opinion). I've shot a bunch of other pistols with integrated trigger safeties and none of those models left my trigger finger feeling raw after an extended range session. The other negative point of the PPS is the felt recoil. Between my G26, CS9 and PPS, the PPS has the snappiest recoil of the bunch.