We've been on the Wonder and Magic. They're pretty much the same. Haven't been on the Dream, but I can just imagine it to be better since it is so much bigger.
We enjoy Disney cruises outside of Florida, so if you want a recommendation, there are 7 days cruises to the Mediterranean, Mexico and Alaska. We've tried the first two and will try Alaska this summer. We haven't had a bad cruise yet. They've all been wonderful.