There's just the two of us now (retired), and even though a Studio would work out just fine, we still prefer the 1-B/R simply because it feels more like 'home'.
When points are tight or it's high season, we'll get a studio, but mostly only if it's BWV, VWL or BCV because I feel their studios feel more like 'suites' like you'd find in some other hotels.
Even though we're OKW owners, we don't especially like the OKW studios, even though they're physically larger than the other resorts. The double beds just makes it seem too much like a hotel room. (I know, they're not, but with the kitchenette and bath tucked away back in the corner, the "room" part with the two beds feels like a hotel)
But for 1-B/R villas, OKW can't be beat. For us the best use of points is a 1-B/R at OKW, or a studio at any of the other WDW resorts. When it's more low point seasons, then we want a 1-B/R no matter where we're at.