I think you will have a great time on Epic. However, I don't think you can compare Epic & Oasis. You are not comparing apples to apples. As a matter of fact, as of today, there isn't any other ship like Oasis (IMHO).
Oasis has so many different venues. I absolutely LOVED Oasis, but we are sailing on Epic next February. As long as I go into it knowing I cannot compare one ship to the other, I know I'll have a great time on Epic. I'm so anxious to see Epic....the new room designs and the entertainment look awesome. I love the Studio concept......NCL was so smart to implement this category of cabin. I think it will prove to be a great idea.
I'll be very interested to read your review!
Mary Lou Scanlon
NCL Pride of America April 24, 2010
NCL Epic February 12, 2011
RCCL Allure of the Seas - September 18, 2011
Celebrity Eclipse - February 11, 2012:
RCCL Navigator OTS - February 9, 2013