This is all really good perspectives. My girls 8/11 love Disney (as does myself/boss) but we are DVC and go to Disney at least 1X per year so I can see characters anytime I want. The 7 day Treasure was nice before we went to Disney before/after which was a nice change of pace given the relaxed atmosphere of the cruise.
It's personal preference but, IMHO, it is VERY difficult to beat
RCCL Oasis/Icon class ships from an entertainment/food/value stand point. Price increase aside, I view Icon as literally the greatest all-around ship on the market and I was on a PACKED summer cruise.
I've graduated from balcony to junior suites to the star class suites on RCCL. Unfortunately, my 11 day Jan 2026 RCCL cruise which is now $15K is literally $20-25K in future years and a line has to be drawn. The boss won't do MSC (World Nation) Yacht Club nor NCL or Carnival. And Disney doesn't really have a comparable star class experience but that's not a deal breaker. The biggest issue with Disney is the price point and lack of sailings -- I don't do 3-4 day. Disney's food was as good (maybe better) than RCCL and the entertainment was fantastic. Yes, the service was great but I've NEVER EVER had bad service on a cruise ship (even Carnival).
With that said, dry dock Fantasy is nice but even the $150M upgrade to Oasis didn't address the older design/decor of the rooms. It's better than nothing. I've also read the pools on the Fantasy have complaints as well so unclear why the boss views that as better.