For me it comes down to the G17 and my G41. The G17 is my EDC and serves dual duty as a range & Run-N-Gun pistol and its just an overall pleasure to shoot. The G41 is just fun to shoot no other reason than that lol.
Glock 23. It's the only Glock I own. Also the most versatile pistol I own. Perfect size for carry if I feel I need that much firepower. And it has more .357 Sig and 9mm rounds fired through it than .40 caliber. I think the .40 barrel is in my safe somewhere, if I ever need it. As much as I don't care for the wonky ergonomics, I can't talk myself into getting rid of such a versatile platform.
Glock 22 it's just what feels good to me to shout. Just got a glock 27 for everyday carring so we will see how it pans out. So far I love it's size, fits in the small of my back great and bearly even feel it compared to the glock 22. Added benefit my girlfriend can pull it out as well by simply giving me a hug and playing the scared girlfriend if ever attached. Not going to lie that's kinda hot.
The G43 , why? For starters it fits my hand well , I can't say that for most any other Glock I've handled or fired with the exception of the similar size G42. Also the G43 is a pleasure to shoot , fairly accurate and easily concealable. Hands down my favorite Glock!
Glock 36. It is a good size and don't give up anything in accuracy department. With the plus one mag it holds the same number of rounds as my 1911 and it a smaller package. It is also just a accurate as the 1911 and only cost half as much.
G3 Glock 17, my favorite and first issued sidearm. It usually sits idle in my safe but will always be my favorite. We have since moved on through the Glock 21 and in to the Sig 227 and 320.
23, I bought a new gen 3 19 today and felt guilty. It's like I was cheating on my 23 on my hip with its 19 year old sister. Just so I could buy 33rd happy sticks and not have to buy over priced mag extensions.