you don't see a lot about the Sig 1991 because it's not been around all that long. 1911 people are pretty loyal to the brands that they have been using. Like me. I like Para Ord and Springfield. I do not like a Kimber but it is a good gun. I just don't care for them as well. So I would be inclined to talk about them. I do like Sig Sayer guns but have not had a lot of experience with the Sig 1911. I've heard good and bad. But you will hear bad things about a lot of better 1911's many times because people get the wrong type for their shooting . You can't carry a target model gun and expect it t be as reliable. Tighter tolerances mean less room for dirt and things to get into before a failure. As you can't get a combat gun and expect to group in 3" or less at 50 yards.
Any suggestions? Comments on the particular models? Right now I'm leaning towards the Sig 1911, however I've heard great things of the XD45 and the P220 intrigues me. I have had the opportunity to hold and examine all of them, like the weight of the Sig 1911 though I prefer the grip of the XD45.