Hey Maggie,
Not too sure what the diffrence is between the two trips but I DO know that Disney cruisers are NOT allowed to use the pools - beach use only. Which is a total bummer. We will be on The Wonder 1/15-1/19 and I booked a room at The Comfort Suites on Paradise Island so we have FULL use of the Atlantis facilities. The room was about $200 and it is so worth it. We stayed at the Atlantis last fall and the pools, slides and shark/fish tanks are the highlights of the hotel. Our 5 yr old son loved it. Hope this helps.....good luck and have fun!
Take care,
HeatherAnne