I know there's no comparing oasis class to any other ship no matter the line. We sailed Majesty back in 2000 right after we siled Carnival Fantasy so it was a good way to compare the line since the ship were similar.
I will be happy cruising either the oasis or Freedom class of Royal but really want to see Allure like you said just to see? I'm afraid that the Radiance class may be a little to quiet for me and I think I like the idea of the Promaede .
Heck with ths cold weather I'll cruise anything if I could leave right now.