My dd, almost 12 now, has been to many WDW resorts. Her favorites, in order are....POR, Pop, BWV, AllStarMusic, Contemporary, BCV, Polynesian. The only thing she wishes she could change about POR would be the pool slide. She loved it until she found the slide at BWV!!! She just loves the clown slide. When we stayed at BCV in June I was sure she was going to love SAB the most since she is a fish. But, that wasn't the case. She hated having to leave the pool area to get to the slide entrance. She said she felt a bit uncomfortable doing that.
She loved the theming at Pop last month. She actually liked walking around the resort looking at the different 'eras'.
I don't think you can go wrong with any of them though.