Italy is probably one of the best places to see the show. You get a perfect view of Spaceship Earth when it does its thing during the intro, I See the Light, and the finale. You also get 2 perfect heartbeats in the finale. The spotlights from around World Showcase are also easier to see when they converge (
"Come Together As One!..")
Another spot is near Japan for same reasons above. But that place is more crowded seems like.
Italy pics:
View attachment 782038
View attachment 782039
Basically if you line yourself up with one the barges, you'll get some perfect heartbeats. All that really matters then is if you want to see Spaceship Earth's interaction with the show and proximity to the show.
Also note, I haven't seen the show in-person yet, but I see pretty much every livestream and video posted on YouTube lol.
This comparison video I made a while back will give you an idea of seeing it from Italy vs. Japan: