I haven't been on AOS, but I was on her sister ship Navigator of the Seas this past November. I have also been on three Princess cruises. I love Princess, but they do not compare to RCI's Voyager class ships.
For young people in their 20's, the AOS would be much more fun. It's so glitzy and has so much to see and do. The Princess ships are a little more...I guess the word would be "refined". But I do not mean that the AOS is not. Both lines are fantastic.
If you are interested in seeing what the Navigator of the Seas is like, go to our website for lots of pictures and a review. Look under Eastern Caribbean at www.thepreismans.com
You will also find the Crown Princess under Baltic and the Sun Princess under the Panama Canal.