1911- Had several...Auto Ord...POS. Wouldn't function w/ two trips to Auto Ord. Prob 1986-7 time frame. Sold it for a loss. Two Springfield Armory - Full size and a Champion model. Both shot well and the full size was set up as I wanted it. Paid a bunch to get it put together; Flat main spring housing, ambi safety, sweet sights, trigger job, opened and flared ejection port. Prob 1994-95 time frame. Both sold later.
Recently shot a Ruger 1911. Well made, very accurate and a nice trigger. Alloy frame and SS slide. Cool looking too. Functioned fine.
+ Grip feels good in my hand and the single action triggers are generally pretty good, esp on the Ruger I recently shot. No rail for a light back in the day although many are made now that do have 1913 rails for lights or other items. - mag capacity.
Glock 21 - Never owned one but shot several. Good mag capacity and functioned fine. - The grip is just like the Mod 20....a bit too big for my liking.
Have a Glock 21SF. The grip feels much better in my hand compared to the G21. + Good function, night sights and mag capacity.
I got "Lucky" on Gunbroker a few years ago. I was reading about the 45GAP G37 which has the same grip size as the G22 and 17. I bid $330 on a Glock 37. (Full size 45GAP). No one else did....so, I have a G37. Excellent grip size, good function and night sights. Mags hold 10 rds. Similar ballistics as the 45 ACP with a nice grip. I'll keep it until I run out of my 45 GAP ammo supply and then sell it. - The ammo is generally hard to find in a brick/mortar store and is more expensive than 45 ACP in either on-line or brick/mortar.
I can shoot a 1911 more accurately because of the nice single action trigger. Glock triggers can be improved greatly to aid in accuracy. As far as reliability, my experiences w/ Glock have been outstanding. My experiences with 1911's has been good as well but my first 1911 from Auto Ord had me scared off for a while. Not a big issue w/ the one from a specific manufacturer. The one's I've seen at the ranges are working well. The 1911 grip feels better in my hand when compared to a G21 but the G21SF feels equally well. Glock has the + in magazine capacity. I also like the idea of the accessories for the 1911 although there is a bunch of stuff we can do to the Glocks nowadays.
If it's my choice, I'd go for a 1911 over a G21 simply because of the grip size. If I could have a G21SF as an option too, I'd go with that one the other two.
Love the Glocks because it's so easy for me to carry extra mags 22 extended mags fit my 27 which is a major plus for me. 
A 1911 will reward a good shooter much more so than a Glock. You always hear about Glocks getting the nod when it comes to reliability, but (knock on wood) I have yet to experience a FTF with my 1911.
