I've cruised on one of Norwegian's smallest ships and one of its biggest. I'd sail on only one of them again.

• Norwegian Cruise Line offers ships from barebones basic to amenity-heavy with grandiose attractions.
• I sailed on Norwegian Sky and Norwegian Breakaway this year, which were built 14 years apart.
• Breakaway provides more modern amenities and dining options than the older and tinier Sky.

Norwegian Cruise Line has a diverse fleet of 19 oceanliners, ranging from small, basic ships to giant ones with action-packed amenities.

While I have yet to experience the company's extremely attraction-heavy Norwegian Prima class, I have sailed on the more bare-bones Norwegian Sky and Norwegian Breakaway.

The ships were built 14 years apart. Sky, Norwegian's second-oldest and second-smallest ship was unveiled in 1999. Breakaway launched in 2013 and is tied as Norwegian's sixth biggest ship at about 145,600 gross tons.

Breakaway isn't new by today's standards. But at twice the size of Sky, it has modern attractions and plentiful dining that offer a fair amount of added fun that the tinier ship lacks.

After sailing on both, I think I'd have a hard time sailing on Sky for any more than a few days — but Breakaway is a good middle-ground for longer sailings.