I’m old enough that I still think of the beach pool as the “new” pool, even though we swam in it in 2001. That’s the pool for the waterslide, fun kiddy play, and organized pool activities, while the courtyard pool is more for peaceful relaxation.
The courtyard pool has a bar but much more limited menu, because the QS restaurant is a short(ish) walk away. We spent much more time at the DVC side pool with the kiddie area and the slide. The bar there has an eating area with tables and umbrellas facing the beach. More scenic, imo.