I like Ragland Road better for both quality of food and the service. But from what I've read, we might just have had a bad experience at R&C.
We sat outside at both places, and, while the lake is pretty and people may disagree, I liked sitting outside at RR better, and people watching at DTD - but that's just me. By the way, the Fish and Chips at Yorkshire...were better that at R&C by far. I know, I know, they are supposed to be the same, but the ones at Yorkshire just tasted fresher - every time we went! I think they were better than RR, too, but DH likes RR better (they are actually different).
Just a few thoughts - try them both (if that's an option)and let us know what you think!