3 Big cruise lines compared in 10 critical areas. Let's look at Carnival Cruise Line, Royal Caribbean Cruies, and Norwegian Cruise Line up close and see how they are different from one another. Find the best cruise line for you using our helpful guide! Best Cruise Lines, Best Cruise Ships, Cruise Travel, Cruise Vacation, Vacations, Cozumel, Best Family Cruises, Best Cruises For Couples, Tui Cruises