They are both very nice hotels.
We have stayed in the Dolphin a couple of times. The first time we stayed we had a spacious room. The beds are called heavenly and they so live up to their name.
The hotels are located between Epcot and Hollywood studios and both can be reached by boat. If you are energetic you can also use the walkway. We found the walkway particularly handy after watching fantasmic as there was a huge queue for the boat back to the hotel.
They have nice restaurants like Shulas and Bluezoo and also Picabu which is a quick counter service place which also has groceries.
At Christmas time there are tree lighting ceremonies on selected nights and you can also meet Santa. They also have a piano player. You can sit and relax with your drink and listen to the soothing music which you need after a long day at the park.
As they are not disney hotels they dont have the disney theming. However, they are still well presented. :p015: