Well since they ruined the Jungle Cruise, gave Cinderella's castle a tan my vote goes to IOA.
Seriously though, Islands of Adventure is the crown jewel of Florida (or even the East coast). 9 E-tickets, 8 themed lands, 28 attractions it has the best collection. MK is great but it's Disneyland...
I think if they were to update the show to be more like the California version in terms of story. Then give it costumes more in line with the Broadway show of 1994 it would be a 10/10.
Just watch this below, notice how unlike the Florida version of the show it keeps much more of the story...
I feel like a lot of the stuff Jim Hill posts is all blue sky stuff that was tossed around, but never actually saw the light of day. This would be the nail in the coffin for a lot of fans and guests.