I have had a RIA, an ATI, a Citadel, and now a Colt Defender.
The differences in most 1911s are steel and/or alloy used and tolerance of fit. And the recoil assemblies are a bit different with each. I tried the 3" ATI assembly in the 3" Colt, and vice versa, and it worked both ways. Wasn't quite right feel, but functional.
I found the main issue with any of them was not the brand of pistol, but whether the feed ramp was smooth/polished or not. This was especially so with JHP ammo. Not as bad with FMJ ammo, but still a minor issue.
Additionally, you need to use a bit of lubricant. Not dripping wet, but not as sparing as most polymer frame guns. Remember the 1911 is a metal on metal gun that was built for crappy conditions and easy maintenance. Clean and lube it, it will serve you well!
To me, I have the Colt just because I wanted a Colt, and it was stainless and a great price. I would take a Rock Island, or any other as well, with the right price, and the right itch at that time!
I would recommend one with a beavertail grip safety. The GI type safety can still cause slide or hammer bite. The beavertail curtails that!