I've narrowed my options down to these three.
I managed to eliminate the P365X (my favorite ergonomically, but it's a Sig), the XMacro (fantastic design, but it's too big, and it's a Sig), Hellcat Pro (great design, I liked the trigger but the grip is too blocky like a Glock), and M&P9 Compact 3.6" (too big).
So I'm left with the Shield Plus, CC9, and 43X MOS.
I think the grip on the CC9 is just a hair too short and the shape isn't as comfortable as the P365X. The grip is fine with the 12 round mag but teetering on too small with the 10.
I don't really like Glock. But the thin 19 style frame is a great design and Glock finally making a 15 round magazine after years of begging (in typical annoying Glock fashion) makes this a compelling option. I think the grip is slightly too long. Probably too long as the CC9 is too short.
The shield plus is nice. I don't love it in my hands. It's weird, some of the triggers have this weird almost non-tactile double reset and others have a very nice single tactile reset. I don't know what that's about. The triggers don't seem consistent to me. But the ones I like I really like and the ones I don't are a deal breaker for me. It's funny how the larger capacity shield plus mags make it taller than the other guns on this list. Which makes the variety of magazine sizes less compelling to me.
Does anyone have any thoughts or experiences they'd like to share? I haven't shot any of these. My local ranges don't have all of these models available for rent.