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Which cruise line has the hottest new ship at sea? Readers, we want to hear what you have to say!

In this, the ninth in our series of Cruise Ship Smackdowns, we’re pitting Royal Caribbean’s one-year-old Harmony of the Seas — the world’s largest cruise vessel —against Norwegian Cruise Line’s two-year-old Norwegian Escape. Click through the photo tours of the two ships in the carousels above and below, then go the comment area to tell us: Which one would you book, and why?

Unveiled in May 2016 and October 2015, respectively, Harmony and Escape are representatives of two of the biggest classes of cruise ships in existence — Royal Caribbean’s Oasis Class and Norwegian’s Breakaway Plus Class. Each boasts all the trappings of a major mega-resort, from deck-top fun zones with massive water slides to multiple restaurants, bars and nightspots. Still, as you can see in the photo tours, each has its own distinct vibe.

Sailing to the Caribbean out of Ft. Lauderdale, Fla., the 226,963-ton Harmony features what just might the most thrilling attraction ever conceived for a cruise ship, Ultimate Abyss. Comprised of two swirling slides, it drops nine stories from near the top of the vessel down to one of its lowest decks. Harmony also is home to a multi-deck water slide area, something Royal Caribbean just began adding to ships in 2016. It’s also the first of Royal Caribbean’s Oasis Class ships with a Bionic Bar where the drinks are served by robot bartenders — a concept that first debuted in 2014 on Royal Caribbean’s Quantum of the Seas.

Sailing out of Miami, the 4,248-passenger Norwegian Escape boasts one of the largest water parks at sea with four major water slides; a giant spa with a flurries-filled snow room; elaborate production shows including Broadway’s Million Dollar Quartet; the…