I can only echo that. A single can be "improved" than the opposite depending on the requirements. Commonly, the 9mm has my vote And that i possess a lot more 9mm handguns than .40S&W. My two PPCs may also be 9mm (Sub2000 & CX4). That said, I do such as 40 S&W a lot and just bought a Beretta APX that I really like.Just before we commence in earnest,