Hi David:
Welcome to TUG:
Yes, Interval will give you the greatest variety of choices. but you'll need a membership through dates of travel.
Gold weeks are 22 - 27 and 36 - 49 If you have not yet reserved, make sure to get the highest demand week in your season for 2020. At this point in 2019, you're very close to the date to reserve Thanksgiving week, which Interval rates as a Travel Demand Index (TDI) of 125.
Marriott's Inventory Release Calendar for 12 months in advance shows:
Wednesday, November 20, 2019
at 6 am PST
is when you need to be online to book the week which begins Sat Nov 21, 2020.
When you go to make the reservation, choose Owner Occupy. Select Full Villa Lock-off (or similar wording to that effect). Then call Marriott to ask that the unit be split into its two parts, 1 br and studio. Marriott charges approx $90 to do that. The advantage is you can trade the separate units in II and get 2 weeks of vacation.
If you have your Interval membership by then, ask Marriott to deposit to Interval. When you log on to Interval, you will see the two weeks under Exchange > My Units
You will have 3 years to use the deposited weeks.