Any Carnival Cruise Line vs. Royal Caribbean cruise discussion depends on a ton of factors, including personal taste and what a perfect cruise actually looks like. In this article I will point out the 10 biggest differences between Royal Caribbean International and Carnival Cruise Line so you can better make this decision yourself. A Royal Caribbean cruise can feel more sophisticated and upscale but definitely with a playful and adventurous vibe. Royal Caribbean Group’s cruise lines include Royal Caribbean, Celebrity Cruises, and Silversea. Carnival Luminosa, Carnival Venezia, and Carnival Firenze are the only Carnival vessels that don’t have irons or self-service laundry, while there are no Royal Caribbean ships that have irons available for passengers.