My favourate movie parts were:
Aeris's death (Aalso I didnt enjoy it, just a good part of the game)
When Weapon attacks Junon
When the other Wepon attacks Midgar

My favourate game parts were:
The first time in the shin'ra HQ on disk one
Just outside Midgar all the way up to Junon on disk one
When you go back to Midgar on disk two.