Thanks for the responses! Yes, my question was specifically about the multi generation trip I'm considering now, but I don't mind the input overall, in case DH and I can ever ditch the kids for a solo trip! (I WOULD like to try Virgin...)
We have done the major lines and I wanted to make sure I wasn't overlooking something. We haven't loved the last couple of Carnival. I generally like Royal but our last one was on an older ship to Alaska - so there wasn't much, and the rock wall kept closing due to weather. I'd be happy to try them again, and the NCL ships are usually a good in between for the big family trips.