Just to be clear on the triggers...
Kahr now offers three different triggers; the original K9 (1/2") and the shorter pull on other models. They now offer, on the PM model, a manual safety and "enhanced" trigger. I've only owned the standard NYPD 1/2" and the 3/8" elite. I haven't even seen the enhanced trigger for sale. Personally, I prefer the shorter trigger.
The only real differences that I can say would influence me if deciding between a C and a P model is the front sight dovetail, or lack thereof, and the fact the only the P comes in all black. I like all black for carry guns. The other differences are immaterial IMHO.