I am able to only echo that. One particular may be "much better" than the opposite depending on the conditions. Generally, the 9mm has my vote And that i have more 9mm handguns than .40S&W. My two PPCs can also be 9mm (Sub2000 & CX4). Having said that, I do similar to the forty S&W a great deal and just acquired a Beretta APX that I really like.The