I am able to only echo that. A single may be "improved" than the opposite based on the standards. Generally, the 9mm has my vote and I have far more 9mm handguns than .40S&W. My two PPCs can also be 9mm (Sub2000 & CX4). Having said that, I do just like the 40 S&W a great deal and just acquired a Beretta APX that I actually like.The R7 Mako is an ex