I want reliability #1, size and weight # 2, cost # 3. Give me your opinions.
#1- Most modern polymer .40 sub compacts are reliable (Glock,XD,M&P,PM)
#2- PM wins hands down with the other 3 all about the same.
#3- XD wins hands down since i can buy them locally for $399-$429 for the full package.
Glock is thick and pricey.
M&P is both of those also.
XD is thick but less expensive.
PM is thinnest and smallest but least capacity also and the most expensive.
One thing to not forget is to hold each and see how it fits your hands and how you like the trigger pull.
I carry a 5" 1911 75% of the year, But in the summer ive switched too the XD subcompact .40 and i couldn't be happier.
My second choice would have been a tie with the Glock and Kahr PM as i like different features of both even tho they are very different when comparing them to themselves.
M&P last, I just couldn't like that gun, But while looking at it the shop had a used but like new P99 S&W and i almost bout that gun as it was heads and toes better than the M&P imo.
Thats just my opinion M&P guys, Your gun is a very good gun. Its just not one i liked for some reason.
On a Different angle Taurus makes the PT140 which is around $350 and smaller than all of the above besides the PM and is known for being reliable.
But many people dislike Taurus on forums so i have a hard time recommending them unless people say they are open to them. I had the same version in a single stack .45 PT745 and it was a hard gun to beat for the price and only the Kahr PM45 could out do it in size and weight but at 2x the price.