I prefer Wilson overall and have a new one on order right now. I just prefer the overall combo of quality, build choice, customer service and reputation. The two I currently own have no complaints from me.
I think Brown builds the best looking 1911 bar none. Great quality as well. I only have 1 Brown but would buy a second without hesitation.
The Baer I had was a 4 1/4" TRS, to me it was not as well built or reliable as the Wilson or Brown 1911s. I have read that Baer <5" have issue so that might be the reason mine had issues. It was built overly tight IMO. I would buy a Baer again but only a 5" model.
Never had a GI or SF Custom but have read great things.