My favourite is currently Animal Kingdom. The last couple of times that I've been over the last three years, the best days that I had there were in Animal Kingdom, and quite a few of my favourite rides (Everest, Kilimanjaro, Dinosaur, etc.) are there. One of my favourite moments that I've ever had in Disney World was in 2017 when we were going around the park while Rivers of Light was on and ended up going on Kilimanjaro Safaris. It was so quiet because everyone else was watching the show that we went straight on and had the entire car to ourselves while it was all dark. Absolutely amazing experience.
Before that, it was always EPCOT. While I finally had a chance to appreciate the World Showcase in full, this year, instead of being in a family group who just sprints through the entire area just to say that they've been there, every single thing that I loved about it is now either gone or vastly different, except for Spaceship Earth (and goodness knows what's happening with that, now), and The Land, so it's very quickly dropped from my favourite to probably my least favourite.