The one where you own. October/November is going to be insanely difficult to book due to the 50th Anniversary celebration kicking off. Book your home resort and then switch at 7 months if you can.
Personally, I wouldn’t have 3 adults in a studio. Too crowded. No privacy. But if I had to do it, I’d want a studio at RIV. The sofa bed is a real mattress, not a foldout. And there’s a small, bunk-size Murphy bed for the child. At least everyone would be able to sleep in a real bed. It has a split bath with toilet & shower on one side and a sink & tub/shower on the other. Skyliner access and some impressive dining options.