RSG has the perfect mix of rumple, quirk and a "championship" sense of scale. That alone makes it the best course in England that I've played. Throw in an excellent set of greens and it really is a stunner.
However, Deal has an even better set of greens and as such, a really great variety of holes.
Walton Heath Old is a clear length ahead of the New but both are the best examples of what a true heathland is.
I did a similar trip to yours last summer. Very memorable few days. I chose well.