We own direct only at Riviera, no issues booking rooms at 11 months (I am a planner though, so no biggie to me,) and we love it. My husband only wants to stay Riviera, but I like to try the other resorts out with split stays. So far, we love Riviera the best for the rooms, location, and dining, but we love the vibe of Poly, CC, and Boardwalk.
Dues started out high but have stayed pretty steady since then, and I think we got cash back during the shutdown year (not a lot, but a credit is a credit!)
The splash pad is awesome for littles, and while the main pool is not super impressive, it's laid out well to keep an eye on littles and kids in the big pool -- while being adjacent to the bar and bathrooms for emergency potty runs and snacks. I think it's the best laid-out resort and appreciate the small footprint and dedicated Skyliner station.
Just my $.02, but the resale restrictions aren't that big of a deal on resale market so far, even with tumbling resale prices for other resorts. It's holding pretty steady at the $135pp mark, which I think is fair and not at all the doomsday scenario folks predicted. If you plan to hold a decade at least, I'd think you'd make your money back at least, so then you're getting awesome vacations for dues+.
I think it's better to buy versus rent, but if you don't think you'd get enough use of it, keep renting. We like the resort stays so much, we're fine doing that as a trip, too. Forces us to relax.