Celebrity Cruises and Royal Caribbean International share a parent company, but that’s all they have in common. The Celebrity ships are some of the most beautiful at sea, with modern designs and impressive contemporary art collections. True, these ships' best models date back to 2008, but they still feel well-thought-out and sophisticated — and the line continues to excel at an elegant take on big ship cruising for the 40 and older demographic, most of whom travel in pairs. Royal Caribbean, on the other hand, serves families and multigenerational groups, among others, with a focus on sporty and adrenaline-pumping activities such as skydiving and surfing simulators, as well as amusement park-style entertainment and cutting-edge technology. (No other line has internet access that is as fast and as reasonably priced, for example.) Royal Caribbean's big, loud, activity-filled ships include the largest vessels in the industry, carrying more than 6,000 passengers. How do the two lines stack up against each other? Here's our take. Pricing Generally speaking, Celebrity tends to be more expensive than Royal Caribbean. Similar to Royal Caribbean, the lowest rates on Celebrity are typically found on the older ships, especially Celebrity Summit. But, even with Celebrity Summit, it's rare for the line to drop prices for seven-night sailings to less than $500 per person.