We’ve been on lots of ships, and we never pick favorites. After all, the “perfect ship” depends on where you’re going and who you bring with you. For example, for a romantic escape — when money is no object — we love Crystal Cruises, and when we want to dive in and cook we choose Oceania Marina or Riviera, but for a family vacation we love Disney Cruise Line. Still, there’s just something about the Viking Ocean ships — the identical Viking Star and Viking Sea — that blows us away. Actually, there are seven things.