In talking specifically about Glocks, I like all one caliber...especially on duty.. I carry either a G22 or 23 on my hip depending on what I'm doing and a G27 on my ankle...I like the idea of interchangeable magazines if I have to go to my backup. With that said, for off duty carry, along with all three Glocks, I also qualified with a 1911, and a colt detective snubbie in .38. It just depends on my mood and more so what I'm wearing and doing that will determine what I carry.
NRA-Line of Duty member
G22- Gen 2.5/ G23- Gen 3/ G27 & G19- Gen 4