I am relatively new on here, but not new to CCW or to guns. I've been carrying for going on 38 yrs. now, and I always carry a 45.
I know that most on here believe the 1911 format is the best there is, and for the most part they are right. There is nothing like a smooth SA trigger, a clean breaking shot, and if you have good sights and a fairly tight 1911, very accurate. They are slim and fairly easy to learn to shoot well for most people. I"ve owned and carried some type of 1911 mostly Colt for nearly 35 yrs.
Now for the Glock. I have owned a G21SF, and with my small hands it was still a tad too large for me. It was very soft shooting even with +P rounds, and very combat accurate right out of the box. No external safeties to worry about, simply draw, aim and fire. It always goes bang, every time!
I have 3 of the G30SF's, same as the G21SF only fits my hand better, even more accurate for me than the G21. 11 rounds of 45ACP are very comforting and you can carry and use the 13 rd. G21 mags in your G30/G30SF.
I also have a G37 and 2 G38's (45GAP). Same or a bit better ballistics than std. 45ACP, but in a G17/G19 size format (with a fatter slide.) These are also excellent, accurate and soft shooting handguns.
Why Glock? Reliability from the very first round fired. Very little maintenance required, although I do field strip and clean them after every range trip. Fire every single factory round without a bobble.
For me the G30SF and the GAP models fill my hand properly and absorb the 45ACP/45GAP recoil very well, making for quick follow up shots.
If you have the opportunity to fire the G30/G38, do yourself a favor and try them, they both carry very well.
Good luck and always stay safe.