Tim,
I didn't play Riverdale Dunes when I was there, but I did take a ride around in a cart for a look see before rushing off to the airport. I have played multiple rounds at WH and RC.
What I most vividly remember about RD were the "dunes" on some holes that required you to hit your tee shot to the correct place in the fairway if you wanted to see the green. It didn't strike me as being overly punishing, and I am a shaky driver at best. There was some water out there, and I dislike water holes generally since I like to try to recover from my mistakes. The water didn't seem like to be overbearing like it can be on some courses. I did notice a few interesting greens at RD, but in general I think I can safely say that RC and WH have more interesting greens, with the nod going to RC.
Without having played RD, I don't know how strategic it is, but RC for all its width is pretty strategic, and you begin to learn over time where preferred angles are. The drawback to RC to me is the width off the tee, that doesn't challenge you enough to intimidate you. The course makes up for this with the demands of the next shot, but I feel like every shot should have some amount of pressure on it. #11 and #14 are exceptions before someone starts howling at me. Oh, and #18 is my own personal demon pit.
For me I would rank the 3 courses RC, WH, and RD. My primary consideration is always the greens and surrounds, so factor that bias into my opinion.
Adam,
What's going on at WH, has Josh left?