One's decorated in style of Art Nouveau, the other is Art Deco. Yea after about 6+ cruises on each I couldn't tell you what the difference is between those styles.
....
The Wonder has had the enclosed Cove Cafe / Outlook Cafe for her trips up to Alaska, but now they've taken that space on the 10 deck and ruined it by making most of it concierge exclusive, and the little sliver for us common folks is pretty small. I don't think they created those spaces on the Magic.