I can only say we were very pleased with Explorer (the only newer ship) we were on. Service was fine and food very delicious. We were then on Navigator, Mariner and then Voyager. Those ships were also up to snuff. The Prime 7 on Voyager was very small, crowded and noisy.
We would not be back for cruise 5 if we weren’t fully satisfied with the service, food and accommodations. We have had staff recognize us and we recognize them from cruise to cruise.