Would you trade (your model of the micro-compact M&P Shield 9mm) for a Sig P365X?
I've become very negative on S&W after the long list of problems I've had with my Shield Plus Performance Center. I've had huge problems with their customer service and also their repair department. Currently the Shield Plus is on its way back to S&W for a 4th time. I no longer can recommend S&W over any other brand.
There are several things about the P365 that I do like.
With that said, the answer to your question is a firm no, I would not trade my M&P Shield for any variant of the Sig P365.
Reasons:
1. The P365 has an even smaller grip circumference than the M&P Shield. My hands and my extra high grip style basically swallow either gun.The larger grip of the Shield Plus versus the Shield 2.0 is the primary reason why I purchased the Plus when I already have a 2.0. I definitely can shoot the P365 very well, but I can shoot the Shield Plus faster while still being accurate.
2. I have way too much muscle memory with the M&P Shield pistols, especially when it comes to deactivating the manual saftey after drawing, a feature I insist on for a CCW.
3. I have too much money invested in holsters and accessories for the M&P Shield.
Now that I've had an issue with the saftey plunger not resetting correctly in my Shield Plus and because I've seen video on Facebook from others with the same problem, I'm no longer convinced the Shield has an actual saftey advantage over the P365.
Despite that, I have not heard of a case where a true and definitive uncommanded discharge has taken place with a P365 or a Shield.
The uncommanded discharges of the Sig P320, in my eyes, damages the Sig Sauer brand so badly that it would be difficult for me to give them my money. Those issues demonstrate the real need for an inertial safety dingus in the trigger with a striker fired gun. It also calls into question the saftey and reliability of the whole modular FCU concept, especially with a sear that's located at the very back of a slide, right underneath the back plate. I believe the various uncommanded discharges of the P320 have taken place over the years due to several issues in the design and not because of one issue.
I dont care about modularity, guns are not Legos. It appears that making a handgun "modular" increases the complexity of the fire control unit and leaves room for more things to go wrong with quality control issues.
As far as internal mechanisms go, I believe S&W has the best design, however they're currently failing at QC in a major way.
Because of S&W's QC issues, poor customer service, and problems in their repair department, it's also hard to give them my money going forward.
The "perfect" micro 9mm CCW still doesn't exist.