Interesting question, DC. And, miracle of miracles, one that hasn't been asked before! Congrats! wink
Definitely GFII. The complexity is what makes it endlessly interesting, capable of being watched over and over again, with a new insight in each viewing. I bet if we were to do an analysis of topics posted on this board, those involving GFII would far outnumber the other films.

Ntra la porta tua lu sangu � sparsu,
E nun me mporta si ce muoru accisu...
E s'iddu muoru e vaju mparadisu
Si nun ce truovo a ttia, mancu ce trasu.