Never done RC, although hope to. I've done eight cruises, six Carnival and two Princess. Actually flipped a coin on an early cruise out of New Orleans-- took the Carnival Dream which was slightly bigger and newer than the Royal Caribbean ship running at that time and had the RC ship flood a day before the cruise. Royal Caribbean pulled out of the port until recently, so decision made. Loyalty points add up, and we're waiting patiently for rumors of consolidation of Princess/Carnival programs to take place.
Had we done RC, we would have run into lots of people who would have slammed Carnival as the Golden Corral of the Sea, complained about behavior, etc. Carnival loyalists point out that there are more free eating options than RC and that the largest RC ships are just too big. Heard the experience described as being trapped in a mall for a week.
Our experience with the Dream was that 130,000+ tons, it was large enough that people started backing up for eating, elevators and activities. Not sure what the experience on a ship twice that size would be.
I'm sure those RC mega ships have lots of wonders like ice skating rinks that Carnival lacks and I'm sure that entertainment is better. Getting tired of the comedy club and the always alike pseudo Broadway productions that seem middling Branson. The sameness of Carnival is catching up with the experience.
We choose Princess for the wider itineraries, better entertainment, and education on board. Their weak point is boring food with much less selection of freebies on the Lido deck.
We're curious about the RC mega ships and will have to give it a try. Think RC has reentered the NOLA market but not with the real big stuff.
Petri dish comments need a reply. We have a friend who is a nurse who won't set foot on a cruise ship. We went with her and a party of eight to an all inclusive in Punta Cana. Everyone but me got Norovirus. When a cruise ship gets hit it comes into port IN THE US and is a news story. Some of these all inclusives are permanent breeding grounds and since they're out of site in a foreign country escape detection. Cruise ship hygiene standards are much more careful and exceed the average restaurant chain as well-- sort of like air plane crashes get more publicity than car wrecks even though the risk is much smaller.
To sum up-- curious about those 200,000+ ton RC big boys and will have to give them a try, but the combo of Carnival and Princess have earned our loyalty. Carnival loyalists have generally tried RC and come back-- they point to little things like easily accessible soft serve/yogurt (something I miss on Princess) and better freebie food selections. I've had the good fortune to not sail during spring break so haven't found any of the Carnival experience to be that unruly. Carnival does have a sameness about it, as does Princess, so I'm looking forward to new experiences. At this stage, I'm more open to Royal Caribbean than Norwegian and hopefully within the next year or two.....
No such thing as bad cruising.