I'm afraid that Quantum is a bit too gimmicky. They're trying for "new" and "innovative," but I"m not sure how great the North Star and Sky Diving thing will be. But they'll give it a try. The virtual balcony thing is a great innovation I'd like to see. That being said, I agree with Matt. "Best" is a subjective term. As it stands, Allure and Oasis might not be defined as the "best" by many passengers. They may be the largest, allowing for a variety of amenities, but sometimes smaller == luxury == more attention to detail == better service.
The sheer size of the Oasis class will remain in-tact and a call-to-fame.