Oasis did just complete it's big $100+ million refresh late last year, so it would be a little different from the last time you were on it (assuming you didn't just sail on it in the last couple of months). We were on the Oasis before it was spruced up and we have been on the Harmony (both out of Port Canaveral). I don't know enough to talk about any of the subtle differences between the different Oasis class ships, but they all seem to be pretty awesome!