Range Rental Report
I went ahead and rented both. The 1911 they had was not a RIA, but an old, beat up Springfield GI. The SIG 220 was a brand new standard size gun in DA/SA. He told me the 1911 would jam on me, because theirs was old and hadn't been maintained. Neither gun was exactly the model I was looking to buy, but close enough to give me an idea. I had 100 rounds of WWB with me to conduct this test.
To make a long story short, I liked the way both guns shot. They were both accurate at the distance I tried (about 25 feet); the SIG was slightly better. Both felt good in my hands. I alternated shooting them one mag at a time. Other than finding out the basic feel and way each gun worked, I wanted to see which one I gravitated to. I noticed as time went by, I picked up the 1911 more often. I liked the way it felt, how slim it was, etc. I even thought the tiny GI sights were easy enough to see, even for my aging baby boomer eyes. And while this particular gun did jam a lot, just as the guy predicted, his brand new SIG also jammed every time on the last round in each magazine.
Overall, while the SIG was more accurate, I "liked" the 1911 more.
After I came to that realization, I had some rounds left and for kicks rented a Ruger P97. It looked like it hadn't been rented much. Now here's the surprise of the evening! The gun shot like a dream. It was as accurate as the SIG, never jammed once, felt good in my hands (maybe not quite as good as the 1911, but on par with the SIG) and had ergonomics superior to both. The one thing I didn't like was the long trigger pull. But the trigger broke cleanly.
In summation, having eliminated the SIG, my choice will now be between a 1911 and a Ruger; either the P97 or the P345.