Both are good, solid, basic 1911s. The Remington R1 is easy to find around here. The Ruger SR1911 is just about impossible.
I waited for the Ruger as I liked the finish better, and picked one up at a gun show for $700 (matte stainless, wood grips). Very satisified. 500 rounds through it, zero issues, came with two mags, and the Ruger mags run great.