There are a number of things I like about the Scamp
16. We have layout 4.
Scamp Travel Trailers: 16 Foot Floor Plans
Front window plus side bath provides more light
and makes the Scamp look larger than a Casita.
Wider aisle over the Casita 16, at least the ones I've been in. The sink side is only 1.5 feet deep providing an additional 1/2 foot in width.
Kitchen counters on both sides, provides an open look and potential for more storage.
The Scamp is lighter than the Casita 16 meaning a lighter tow vehicle.
I think that the Scamp is better insulated but have no proof. It seems to me that there's an aluminum foil composite behind the rug like surface coating in the Scamp that does not exist in the Casita.
Scamp has a nice online parts store.
Bathroom is larger, the bottom of the Casita is fiberglass.
For us the larger bathroom is not relevant because we usually take showers in the campground but the Casita's is handy particularly if yo do a lot of boondocking
Though the bottom of the Casita is wooden it is coated with resin and I've never seen any problem with floors from the bottom. We painted our's white for appearance (though it's mostly me that sees it.) Our rig is 21 years old and no leaks
I can find.
We bought our's used and the only thing I would change is I would go with the larger refigerator and rear overhead storage (which I added).
We are on the road a lot and have traveled in a Casita, a Scamp and a stickbuilt Sunline. In every case I've modified the rigs to meet our travel needs. Our mods are at the following site.
Preparing a 1991 Scamp 16
Hope that helps. If you have any specific questions please don't hesitate to send me a PM or to ask them here.