I hadn't even heard of either ride until a friend suggested BTC. It looked like fun so I decided to sign up with her and a couple of others. So, I didn't compare the two in advance.

I'll post a ride report when I get back. I'll be interested in seeing how they stack up too although I don't know if I'll try the RtR anytime soon. My list of places to go & things to do keeps growing faster than I can keep up given limited time & money.