Thing is, seaside feels more like a ship (tons of outside space), whereas the oasis class feels much more like a land based vacation. Keep that in mind as well. Many people do not like the oasis class because they are so large, and do not feel like ships, but floating 'vacation factories' . YMMV, but they are two totally different experiences. Even within the Royal communities, there are certain pax that will not sail on anything larger than the Radiance and Vision classes.