Based on resales prices (from most to least expensive) it goes VGF, Poly, BLT/BCV, BWV, AKV, SSR/BRV, OKW. That's pretty close to the pecking order in terms of difficulty booking, though it depends on which room you want. It will depend on the amenities and
point charts as well, but I think Riveria will probably end up near BWV or slightly below in popularity would be my guess.
7 month booking window during peak
DVC seasons will pretty much always get worse as they keep adding more DVC resorts IMO, especially at the upper end. There's a chance it could improve peak season availability in SSR/OKW/AKV, but I don't think it will.