While the longer cruises are nice (Magic), I find the decor of the Wonder a bit nicer (I find Route 66 a bit nicer than Beat Street, Wave Bands a bit nicer than Rockin' D Bar).
Really, it is simply that the decor of the Magic is 99.95% and the Wonder is 99.975%.
Maybe being just one year newer (Wonder) makes a difference as well.
Question: For the finale of Disney Dream's - isn't the pixie dust on the Wonder more than the Magic. It seems that on the Magic is on the side walls and the Wonder it is the side walls and the ceilings? I've always thought that there was a difference there. For that one reason, I like the Wonder better as that is so Magical, I mean Wonderful.