I've had great luck at PVB getting connecting studios when requested, and I recommend it if you really want connecting or adjoining studios.
I've tried to request adjoining studios at most other resorts, but have rarely had them with a few doors of each other, let alone next to each other. Half the time, they are far away, so if proximity matters, book at Poly.
Also, terminology matters in the hospitality world. You want to request ADJOINING staterooms if booking at a property that doesn't have connecting studios. Adjoining means they are touching. Adjacent, on the other hand, just means nearby, and the definition of adjacent can be a little loose -- like all the way down the hall in some instances.