I am able to only echo that. A single could be "improved" than the opposite based on the conditions. Normally, the 9mm has my vote and I have additional 9mm handguns than .40S&W. My two PPCs are also 9mm (Sub2000 & CX4). Having said that, I do such as the 40 S&W loads and just purchased a Beretta APX that I actually like.Most to start with shots ar