You said 9mm. I've been very happy with my Ruger LC9s Pro, and I would recommend it. It is quite compact, reasonably priced, and has been extremely reliable for me. However, I would not consider it small enough for pocket carry unless you have rather large pockets. I carry mine in an Alien Gear IWB tuckable holster.
When I absolutely must have something that will fit the pocket, I go for my Beretta Pico. It fits into a wallet holster and rides in the back pocket. The Pico is very thin, and carries comfortably even when sitting, driving, or bending. I rather like it, but some people have strong opinions about the long trigger and the heavy slide action. Find a way to try it out before you commit to purchase one.
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