NONE. Question, why waste your money on a outside cabin when you will probab;y only sleep and shower in your room. At dinner you could be seated with a passanger from a suite and the shows are the same, no preferential treatment. Many times an upgrade only means moving to a higher deck not a bigger or fancier room. Usually a porthole window cost you anywhere from 2-4 hundred more than an inside. I always book with a specific room in the center of the ship and not too high up. If the boat starts rocking you'll know why. Just my opinion.