I have been on RC and NCL (only one NCL cruise ship - Breakaway) and like RC much better. That said, I have not been on an Oasis class ship and have no real interest in them, esp. on a trip to Europe. They are just too big. I could see it if I was going to the Caribbean, where one tends to spend more time on the ship and so there is time for all the fun options on the ship. But, for me, in Europe, I am more interested in the ports (if not, why fly all the way to Europe) and I would want a less crowded ship - one, esp., that is easier to get on and off of.
You have to decide for yourself. An Oasis class ship is going to be very crowded. Does that excite you or intimidate you?
