The Glock 26 is going to be difficult to beat in the small 9mm category.
-Mine will digest any hollow point I've tried, Federal 115 +P+, Cor-Bon 115 +P, Ranger T 124 +P and 127 +P+ (reliable)
-The Glock 9mm can handle +P and +P+ loads, they use the same platform for 40 S&W and .357 SIG (durable)
Other considerations:
-Height is 4'' which is easy to conceal (Kahr PM9 is a small 9mm concealibility champ at 4'' height plus thinner & lighter than the 26)
-capacity of 10 + 1 (Significant increase in capacity over the previously mentioned 6 + 1 Kahr)
The Kahr PM9 (I had one) is lighter & thinner and mine wasn't ammo picky, it digested Remington and Cor-Bon 115 gr. +P loads just fine. If pocket carry is a primary concern, then the PM9 deserves consideration; however, the PM9 was a little big in the pocket for my taste, a P3AT is the pocket champ, IMP. For my prefered appendix IWB, the difference in concealibility (26 v. PM9) was nill, the extra thickness of the Glock not significant enough to warrant packing the Kahr given other factors, described / summarized in the next paragraphs.
Shootability: First, Load up the Kahr PM9 and a Glock 26 with the same ammo (use some good SD ammunition like the Cor-Bon +p or similar). Now, get a timer and commence shooting timed double taps with an accuracy requirement (example: both shots must hit a 6'' circle at 6 yards). The Glock will IME steal the show over the Kahr in this little comaprison.
Conclusion: for anything other than pocket carry, or maybe ankle carry (yuck), the Glock is going to be nearly impossible to beat if you keep the height at 4 inches, want to shoot high performance ammunition, include capacity, durability, and overall shootability.