I have both and would recommend the K9 for a smaller, easier to carry pistol. Very ergonomic and accurate. Not knocking the Sig, but the Kahr just carries easier. I normally carry the Kahr for close to home and switch to the 239 (357Sig) when leaving town. The 239 in 40/357Sig is a little heavier than the Sig 9 version. But I still feel the Kahr is the smaller, easier to carry piece. The recoil on the K9 is very tame.