IMHO

As I recall, all Bel Air units are identical with 2 bedrooms.
The 2nd bedroom is very small and I would not recommend Bel Air for 2 couples....more suitable for 3 people.

I am more familiar with DIVI.
For 2 couples I would suggest a one bedroom "sleep six" as categorized by RCI.
You get a large common area with pullout sofa, bedroom has King bed plus another pullout sofa.
These units have 2 full bathrooms.
They are located on the Little Bay side or on the Great Bay side or on the hill (Casita rooms) with marginal view.
RCI exchangers do not get to choose.
The "sleep 4" one bedroom/one bathroom units are nice too but not for 5 people....not sure if DIVI would provide a rollaway bed for the 5th.

As far as location is concerned, it really depends on where you want to go. I regard Bel Air and Divi locations as ideal for getting to OB in the daytime and Simpson Bay in the evenings...15 minutes to either.

Just sayin!