For just a refinish, send it to Turnbull. Their Ruger refinishing service is $450 on a gun that requires no extra work. That includes the color cased frame and charcoal blue on the rest, which is the original pre-war Colt finish. I would strongly consider installing a steel grip frame and ejector housing.
If it's only between those two, definitely, absolutely, 100% send it to Stroh. Gary Reeder will polish it until it looks like a blob. He will make it shiny but he has no idea how to keep the flats flat and the corners sharp. Huge difference between Stroh's hand polishing and Reeder's ham-fisted machine polish.