I'm not going to tell you do a search, others have already said that. BUT, if you will spend some time just going through this forum, the past 3 or 4 weeks, and reading threads that catch your interest you will find the answers to all your questions and more. These are all common topics here. Fortunately, you don't have to wade through a lot of topics such as "What's your favorite drink?" or "Help me pick a cruise" like you might see on some of the other forums here.
I agree with Lyn that coming from Celebrity you might like the O ships better, but you never know. Although I prefer the O ships, my first 2 cruises with Oceania were on the R ships and loved them. I actually cruised Oceania before Celebrity, and for the most part like Celebrity just fine. I just take them for what they are and don't expect one to be the other.