In a way, you're comparing apples and oranges. Minisuite to minisuite (sky suite on X) Celebrity wins, due to the even diluted perks. Both would have showers over tubs. In balcony rooms, Celebrity's are a bit bigger, as they have a couch and Princess has a chair. Also, Celebrity bathrooms have drawers and shower doors, Princess has some shelves and shower curtains, even in mini suites. Between a Celebrity balcony and a Princess reserve minisuite, I'd go Princess.