I stayed in interior cabins on 3 major cruise lines. Here’s how they compared — and which was the best value by far.

• As a frequent traveler, I’ve spent many days in interior staterooms on different cruise lines.
• My interior cabin on the Holland America Line’s Rotterdam had a lot of amenities and felt luxurious.
• I love the beds on Princess Cruises ships, but my Norwegian Cruise Line studio was the best value.

As a frequent cruiser, I always book interior cabins. They’re often the most economical option, though they aren’t identical across cruise lines.

So, I compared my recent interior cabins on Holland America Line’s Rotterdam, Norwegian Cruise Line’s Getaway, and Princess Cruises’ Caribbean Princess.

Here’s how the spaces stacked up — and which cruise room I liked best for its excellent value.