My kids are close to those ages (20, 16, 9), and I'd err on the side of two bathrooms/no bed sharing every time. I love the Beach Club but that's the biggest reason we haven't been back - we've outgrown sharing one room and one bathroom when we travel so unless we're traveling with just part of the family or can plan far enough in advance with enough certainty to comply with points-rental terms we won't be back. It is just too hard to get five people showered and ready with one bathroom, and too difficult to deal with sleeping arrangements (our older two are boy & girl and they started refusing to share a bed years ago, but only DD9 is small enough for the daybed... so with five in a standard room we end up having to mess with bringing an air mattress). Also, Stormalong Bay is not a huge advantage unless you plan a day to take advantage, because if you're parks people there's a very good chance you'll be gone before it opens and not back until after it closes on park days.
We do also love Pop, though. It was our favorite of the values even before Art of Animation opened, and having that second food court just across the bridge has only made it better. For a while it was the only resort my youngest wanted to stay at, and in two rooms (for 5 people), there's actually a decent amount of room. We haven't been since the latest refurb, but I think it would be even better now with the pull-down beds.