This is so much fun! Writing/reading about cruising .....I think most of us can't wait until our next one.
I'm a grandma. I have loved cruises on Princess and RCI Freedom and Oasis class. I have loved cruises on Wonder. I tend to stay on the ship b/c in my experience excursions (except in Alaska) don't really do a country justice. When I want to visit a place, I take a land trip.
Castaway Cay is the nicest private island experience of those I've visited. Wonderful family beaches, characters, music, dancing, lunch, even the kids club is available there for the day. Free lounges, chairs, and umbrellas.
In my opinion food is comparable on all those lines. Service is good, staff is friendly.
Lots of adult evening fun on RCI. On DCL the evening shows are fabulous and family friendly.
Going with kids age 10 or so and under, I'd choose Disney every time. Kids generally love the clubs, easily see characters, enjoy fireworks and parties. We can see movies appropriate for families. Parents can relax while kids are at the club.
An adult trip, Princess or the newer RCI ships are just as good, maybe better. Water shows and ice skating shows and evening shows along with fun in the evening lounges.
Trying now to plan a family trip for teens and young adults. Probably go to RCI Allure or Oasis. However just returned from a
Disney cruise with children ages 8 and 6. My third and it was perfect!
Good luck!