Haven't shot most of the Glocks you mentioned. I have shot all of the 9MM and they were fine. I just think that with a 9MM bullet selection comes into play too much.
I have a G22 and a G36. To me it is not much harder to conceal the G22 than the G36. The only time I ever shot the G27 was one month after having my thumb re-attached. I didn't like it. It hurt. Bad. I would like to give the G27 another look see now, due to size, capacity and the thumb has pretty much healed up.
Heres is my thoughts. I am 6'2", 230lbs.
G36 is about as hard to conceal as double stack Glocks.
When I IWB carry a Glock I have to use third hole on a 40" gun belt.
When I IWB a 1911 I use the fourth hole on a gun belt, plus I don't have the problem of the back of the slide printing.
If I am going with low capcity I go with 1911 or 5 shot 357. If I want more rounds I go with double stack Glock.
Seems like most other folks here are able to conceal the G36 easier than I can. Probably due to holster selection and body type.
In my opinion, if you are going to pack a Glock go with a double stack.
My G36 has been flawless and I have no intention of parting with it. I have had it since DEC and have only ran about 300 rounds through it. It has pretty much been a safe queen since I got it. I still haven't paid for it yet. I am buying it from my brother in law and he said give what I wanted to for it. Pretty sure that $400 will be a win - win price.