For me its Islands, and has always been Islands for my favorite park of any. For me personally, here is why I love it:
- Port of Entry and its music literally take me to another place unlike any other theme park I have ever been to, a total transformation from Citywalk.
- All of the IPs there have a special connection to my childhood, whether it be from the park itself (Dudley's and LC) or just from my childhood (literally everything else) it is pure nostalgia everytime Im there.
- Spiderman, FJ, Hagrid's, and JP River Adventure are my favorite rides at the resort past Mummy, so again, easy winner. Ive never ever gotten so wet on JP River that Ive had to change or really take signifiant time to dry off, of course Im on vacation when I'm here so I naturally care less, but it has never bothered me. Vacation or not, you need to prepare to change after the TL water rides which is a bit of a knock against it, but they're also really fun and well done rides that I always feel Im "surprised" about because I ride so little.
- I much prefer distinct IP based lands than "Production Central" which houses.... Minion Mayhem and Shrek and HRRR? Id take the thematic landscape of Islands everyday.
- MYTHOS
The ONLY thing lacking, ONLY, Imo, is a proper show. If they added 1 show and did nightly Hogwart's shows throughout the year, than I really think it'd be widely considered the best park in the USA. Just my take though, updating JP to JW eventually I can only see helping this park.