Having sailed on both I think it's six of one and a half dozen of the other. Both ships are fantastic. I don't think you will go wrong which ever one you choose. The Allure is a bit larger than the Oasis. At the welcome back party on the Allure the Captain joked that the flagpole on the Allure is taller than the one on the Oasis, thus making the Allure a larger ship. While it is good to use an agent, some of the information you seek can be obtained by searching out RCI's website and other sites as well. I personally enjoyed the Allure more than the Oasis. The only reason why is because on the Oasis we had a Jr. Suite (which is wonderful) and on the Allure we had the Crown Loft Suite which is really nice. Both ships are nice and I think it comes down to which itinerary you like most.