issue v. preference
I'm issued a SIG P220-.45, and carry same on a duty rig w/ 4 extra mags and all the other bat-gear that patrol gets these days. I've spent 15+ years now w/ the SIG DA/SA system and am still not really a fan.
My preference might well be the Glock 21. No decock to manage, no change in trigger pull, higher mag cap, same great caliber.