We've used a Casita
16 and a Scamp
16. We started off with the Casita
and found it a fine trailer. The reason we bought the Scamp was the Casita
16 was 3 inches shorter floor to ceiling.
Additionally we preferred the Scamp's side bath over the Casita's front bath. Visually the Casita's front bath makes the trailer seem shorter than it's length. Also the lack of a front window adds to the smallness of the Casita.
Other than that we found them fine trailers.
Neither trailer is perfect for our travels. I find they, like most trailers, are designed for weekend travelers. I understand we are in the minority on the road as much as we are, but both lack storage for regular travel.
I will say the Casita has a bigger bathroom, but it adds nothing for us since we would only rarely take a shower in the trailer.
We like the Scamp's front couch, good for guests, reading and lounging.