My opinion differs from Billy B's, I prefer the Kahr over the SIG in the compact arena. I have a K9 and a 239, quality, fit and finish I would say are the same, the SIG being slightly larger is an advantage for larger hands. I simply shoot the Kahr better and it is smaller, which is an advantage if the gun is going to be carried.
YES, the 239 slide is easier to rack. The Kahr has some pretty stout springs.