As a primary bike, I would choose the FXR. As a secondary bike either would be a good choice. However I must give the "nod" to the shovelhead for the iron head cool factor.
My favorite all time bike that I owned was an 87 FXRS. Man, I loved that bike--- It was very reliable too. My brother had a 70's FLH and he had to work on it quite often---- But in a parking lot, his bike got the most compliments.