I have stayed at the Renaissance and the Waterfront hotel -- both are nice, but I prefer the Renaissance. The service there has always been exceptional over my 15+ stays, whereas the Waterfront seems to be less interested in serving -- it's a very corporate atmosphere IMO.
I've always preferred the Ren's location anyway. P.S. New BOGO Ren certs came out today -- good after the 25th, might make it a better deal.
Have a great trip!