For our second AS we set out to get a twin for a few reasons. Just my opinion and what works for us.
pros: We find the trailer queen to be too small and my tossing and turning drove my wife to sleep on the dinette. It's easier to get into the overhead cabinets with a twins. You have more changing room with a single wide aisle vs two aisles on the side. We liked the look of the long aisle down the middle of the trailer. During the day, a queen bed is always a bedroom whereas a twin can be two couches during the day. When we have guests we can have people hanging out in both areas. Twins give you more options when camping with a non-relationship guest. I can read or work on my laptop all night and not bother my wife. The outside and inside storage on our floor-plan was much better with twins.
Cons: Everyone thinks we have marriage problems
My wife like the bedroom look of a queen vs twins. When it's cold my wife misses snuggling. Although, snuggling in a twin in fun too and is plenty big for two people. Buying two of everything for bedding is a pain.
We would never go back to non-twin. Hope this helps.