Are you thinking about sharing one Mermaid room or a suite at AoA? We've stayed in both types, as well as in a Pop standard room. The AoA suites are definitely the best of the 3 options in terms of layout, 2 bathrooms, kitchenette, etc. And the theming is adorable.
If you are thinking about sharing a standard room, you'd probably prefer Pop since the beds are queen size versus Mermaid room double beds. We prefer to stay at AoA regardless since it's just the 2 of us and we find everything else there to be superior to Pop's amenities (i.e. the food court, overall theming/vibe, pools, buses).