Both hotels are a great choice as you can share amenities like the pools. Both have great restaurants and transportation to Disneys Epcot. There seem to be more families at the Dolphin so if you are a couple looking for some quiet time, I would suggest the Swan.
Pocket Guide: Orlando Walt Disney World® area Hotels
This area encompasses the bulk of the Walt Disney World® Resort, including futuristic Epcot®, Disney’s Animal Kingdom® Theme Park, Disney-MGM Studios®, and the Magic Kingdom® Park. In a place rife with photo ops, Cinderella’s storybook castle is among the most photographed. The Disney-branded hotels here cater to economy and luxury budgets.
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