Here is a website that compares the classes of cruise lines: http://www.cruisedeals.com/ships/

Destinations served by the cruise lines are similar because they all share the same ports.

Crusing can be confusing to consumers because the demographic that the cruise line caters to is very important to your vacation experience. Likewise, what you want from entertainment, onboard experience, etc can vary greatly (Disney Cruises has no casino). Selecting the right cabin is important and it varies deck to deck, ship to ship. You may want to try a travel agent for advice if you are new to cruising. I can suggest Kathy Doyle ([email protected]) or try www.allaboardtravel.com.