I might be able to answer some questions, since I have been scheduled on the Wonder all along.
This sailing has a stop in Freeport, so no day at sea. There is a semi-formal night on the Wonder, but no formal night. The Wonder, I believe, is the newer of the two ships and from what I recall, is Barb and Tony's favorite (as well as Michelle's), so I am expecting it to be very nice. Ladies night is offered in the Wonder's spa, but I don't think the Magic.