Hey, Nobody.
If you are going to carry one of those two, the K9 is going to go down a lot easier. It's slim and it fits, to my hand, at least, great. It's remarkably accurate and the weight of the steel frame tames recoil very pleasantly. I've handled but not shot the P99. It feels like a nice gun to me, but not as easy to carry. I do know it has lots of devoted fans--but so does the Kahr.
Now, this may sound like it compromises my unbiased view in the last paragraph, but I happen to have a K9 I've been thinking about selling. I bought it for my wife, and it turns out she's more comfortable with revolvers, which is fine with me. I carry a revolver myself, so the real virtue of this gun--its balance of ease of carry and reliable, accurate performance--is not getting used (when I shoot 9mm in IDPA, for instance, it's a Glock 17, which is way too big for me to carry). My K9 is in excellent condition and has been highly reliable. I don't know how far east you are, but I'd be willing to meet you at a range in Raleigh if you wanted to try it out and consider buying it from me. I know you'd like it if you had the chance to shoot it. In fact it hurts to think of letting it go, but I've developed a painful need for a marlin .357 lever gun.
So, whether you're interested in my offer or not, there's my partially informed opinion, and the best of luck to you.
CG