Started with a G23 found it didn't provide the concealability I was looking for so I bought a G27. I carry my G27 99.9% of the time as it has the stopping power and has ultra concealability I was looking for....
I changed from a Glock 26 to a Glock 27 for personal carry. My Wife kept taking the 26 so with the modest increase in recoil she does not like the 27. Finally a weapon of my own.
I have a 23 I carried on duty for a few years with a 27 as a BUG. I LOVE my 23.......not in love with the 27, but still have it cause I still carry a .40 as a duty gun.
With that being said though the 27 was my off-duty carry for years.......right up until it was replaced by my 1911 in a Crossbreed ST...........FTW!!!!!!!!!!