There's a great big beautiful tomorrow...
I don't care as much for, "There's a great, big, beautiful tomorrow...blah blah."
After some deliberation, I went with "It's Tough to be a Bug". Although 3D shows are a dime-a-dozen anymore, this one stands tall. The jokes are fresh, the gags are memorable, the in-theater effects are the most enjoyable of all the 3D shows, and the finale is one of the perfect moments in theme park history: grubs, maggots, and cockroaches. Brilliant, one of the few attractions that outshines the source movie.
That's not to say there's much wrong with Carousel. I absolutely love that attraction, even though the final scene feels dated. Although I would like to see it updated, I fear they may butcher it.
Tough choice, but Bug takes it.