The Dolphin is larger.
It has double beds vs queens at the Swan.
At the Swan, the vanity/sink area are outside of the bathroom which makes it nice when getting ready to go out.
There are more dining options at the Dolphin. The Dolphin has the laundromat, game room and a small grocery store.
Having said all of that, I much prefer the Swan just because it is smaller, thus a shorter walk to the room at the end of the day. When you need to get to the Dolphin, it's just a short walk from the Swan.