So, I've sailed all 3... mostly RCCL. To me Celebrity is a touch more upscale from RCCL & NCL. RCCL is the most of the 3 geared more to family & kids. Was just on NCL Spirit Hawaiian Islands to French Polynesia.... ship was definitely adult oriented. Much depends on 1) length of cruise... longer=(older cruisers) less kids, 2) time of year (holiday) when kids are out of school, 3) Itinerary, 4) BIG ONE... Size of ship.. The new mega ships (which I personally hate) are geared to family and have EVERYTHING imaginable on board from go cart tracks to ice rinks and packed in like sardines. I personally prefer the ships under 100,000 tonnage. If I compared same size ship, same cruises, same time.... I would take Celebrity. It all depends on what you are looking for!!! We are mid 60's and tend to shy away from kids, big ships with all the bells and whistles and like 10plus day cruises. We just want quality service. As I started, we cruise mostly RCCL but pick and choose carefully what we want. Just my opinion here, good luck!!