I have a Kahr CW9 and a S&W 3913 (and used to own a 3914 years ago). Some thoughts on these two compacts....
The CW9 is very reasonably priced, they can be found under $400 these days. It's a much lighter gun than the 3913, about 17 ozs. empty, and a bit thinner and smaller overall than the 3913, but not by much. A fully loaded 3913 can feel like a larger gun.
The Kahr CW9 shoots very well, it's accurate and the recoil is quite manageable for a compact 9mm, though the S&W 3913 is superior. The Kahr's trigger pull is very smooth, consistent and pretty light; it seems to improve the more I shoot it. In contrast, the 3913 has a pretty heavy DA and the SA pull could be better; I lightened both up by installing a lighter Wolff hammer mainspring.
The CW9 is a simple, straightforward pistol, it has no safeties, loaded chamber indicators, locks or other such devices. The CW9 is an excellent concealed carry 9mm, as is the PM9 (CM9). It's really too large to carry in a pocket, though it feels very good in an IWB holster, as does the 3913.
The 3913/14 holds 8+1 rounds, the CW9 7+1. The S&W has the safety lever and the mag disconnect; some folks might find these features useful. I think the S&W 3913 would be a better (safer?) gun for those folks who don't always follow proper gun-handling practices; you'd really have to screw up to experience an AD with a 3rd generation Smith.
The 3913(14) is a very finely made firearm, it feels like a real gun in the hand (at least to me), something built to last for generations. The CW9, on the other hand, feels like a quality pistol but, like all polymer-framed guns, it seems a bit disposable. I really don't see any "classic" polymer Kahrs showing up on auction sites in twenty years, though perhaps their steel-framed pistols will stand the test of time.