By Daniel Kline Just picking your cruise line is a major step, but it’s only the first part of finding your perfect cruise. Picking a cruise line requires balancing everything from itinerary, food, entertainment, and what type of passengers you want to sail with. A couple looking for a romantic getaway might opt for Virgin Voyages, which requires passengers be 18 or over rather than booking a family-friendly Royal Caribbean International (RCL) – Get Royal Caribbean Group Report or Carnival Cruise Line (CCL) – Get Carnival Corporation Report voyage. Even within the same cruise line, there can b…