CBR is far nicer than AofA, which is a value (cheap) whereas CBR is a moderate. Of course, AofA doesn't have king bed rooms much, so you might want to consider Pop, which has more king rooms, though I don't know how many and it's not guaranteed. CBR is much nicer (bigger room, more sinks), cost a bit more, but you can choose the king room. Beautiful Caribbean landscaping that's really romantic, with sandy beaches and hammocks, whereas AofA and Pop are really for kids with no beaches or hammocks. CBR has a hot tub, the others don't. CBR also has a sit down restaurant besides the food court. It is right against Riviera, and much closer to Epcot than Pop, where you have to transfer Skyliner, which might be a pain.
On the flip side, CBR takes longer to get around being that it's so big. The buses go around the hotel, making numerous stops, before they head out to the parks, which adds some 8 minutes to the trip. The skyliner can be down sometimes due to weather such as storms.
Pop/AofA rooms are much closer to the bus stop, which they each have just one. They used to not share buses, but now I just heard rumors that they are sharing buses to MK/AK, which is horrible news, but hopefully it's just for now due to Covid.
Overall, my recommendation is to choose CBR king room if you have two adults only. However, if you do end up choosing AofA Little Mermaid room, I have heard people say that having two beds in the room is beneficial: they just spread out their maps on the second bed and it really helps them plan out their day. If you are considering the family suite, I really think they are not necessary for just two people because you might as well get Yacht Club for the same money, and that's a deluxe resort that's even nicer than CBR and in walking distance of Epcot and Hollywood Studios.
P.S. I forgot to mention that Pop's rooms are mostly 2 queen, one of them murphy beds. That means one queen bed morphs into a table, almost as good as a king room!