If it had to be a Glock, and one of those 3, I'd buckle down & learn to shoot a G19 as well as I do my P320.
Every 19 I've tried, I just don't shoot well with.

The Glock derivatives are a bit better, shot my buddy's Dagger much better than my average G19 attemps.

Glock 48mos. I have C&H recut for Trijicon RMRcc with Ameriglo Tall Suppressor Sights and Streamlight TLR-7sub Light. Switching my G43X’s over as we speak.
G48 will be my newest CCW.

Glock 17 for me..

Of those the 17 would be my choice, but I also do love the 26.

Was always fond of the 19, but the 45 is my vote now.