In police uniform I carry a G17, in the customary position on the right hip. During personal time, I carry a G17 or G19 in the same position, with the holster varying somewhat with climate, clothing, and activity level.
I may carry a second gun, which could be a G19 or G17, or perhaps a 1911 or .357 Ruger SP101 revolver. Rarely, I will carry a 1911 and/or revolver, with no Glock.
A second gun will often be worn for left-hand access. I am, actually, left-handed, but functionally ambidextrous with handguns.
I am not a "fan" of Glocks; they are just tools, and mine are reliable, and lefty-friendly. My Glocks will better withstand being stored in an evidence room, after an incident, than some of my nicer weapons.
If traveling to a less-free state, I will be more likely to leave the Glocks at home, except perhaps for a G26, and/or rely on the 1911, or SP101, or larger revolvers.