IMHO I would never never never sell my Glock 17. It is probably the most reliable gun ever made. I would bet that if you had to pull a gun from your dresser in the middle of the night in a panic because your life depended on it you would feel better knowing you pulled your trusted friend. There are a number of good 9 mm bad guy stoppers available.
While some bloggers have said they never have had a problem of reliability with their 1911, most have. The manufactures will blame it on limp wrist and that may account for some of it. Curiously, I've never heard of limp wrist with a Glock. I have a Kimber TLE pro and had lots of problems of stove pipe, failure to feed, failure to eject until I replaced the recoil spring with a Wolff aftermarket one. 1911's require like 800 to 1000 rounds to break in. Ever hear that for a Glock? Most assuredly, the 1911 is more accurate and will become reliable after use. But we are talking about say a 2" spread vs a 1" spread at a given distance. For a bad guy, you only need center body mass. Also like that the Glock has double the cartridge capacity for a mag.
As to type of 1911. I only have a Kimber but there are many good brands. I saw a STI at a gun show and feel in love with it. The dealer said that they are considered a high end custom house. So not seeing the two guns you are looking at, I'd lean toward STI.
Hope this helps.
LEJ from FL the gunshine state.