Which of two Royal Caribbean cruise ships is the world's biggest? Let the 'argument of the seas' begin

Is Royal Caribbean's one-year-old Oasis of the Seas still the world's largest cruise ship or has it been eclipsed by its new sister, Allure of the Seas?
Cruise ship fans already are hotly debating the topic and so too, apparently, are the officers and crew on board the vessels, according to a report Tuesday in Norway's largest newspaper, VG.
The two ships, which can carry nearly 6,300 passenger a piece, were designed to be pretty much identical. But in August, at a press event at the shipyard in Finland where Allure of the Seas was under construction, Royal Caribbean executives revealed to USA TODAY and other news outlets that shipyard measurements showed Allure was a few millimeters longer than Oasis.
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Source: USA Today