The P320 and the Glock have one big advantage over “smaller” options, and that is that they can use the full capacity magazines from their larger brethren. You can carry subcompact, with a flush fit magazine, and then slide a 20rd mag in your bag for “just in case”.
The P365 is a slightly smaller package, but it uses proprietary magazines, with a maximum 12rd capacity.
Tom and I will vouch for the Springfield XD-S. I have the 3.3” 9mm and he has the 3.3” .45cal. If I had it to do over, I probably would’ve bought the 4” model. The 9mm mags come in 7, 8, and 9 round capacity from the factory. ProMag makes an 11rd, which I have two of and they run flawlessly so far.
Im still intrigued by the Kimbe K6s. Not to replace my current CCW... that’s silly talk. It would be an ADDITIONAL CCW... Because drawing another gun is ALWAYS faster than reloading.