This is a very hard question but here goes:

GF1-Vito dies (so sad)-Vito has his last words with Michael-Micheal speaks to Fredo in the bosthouse (so moving)-Genco dies(deleted scene).

GF2-The senate hearings-Michael finds out it was an abortion-scenes showing Vito and his kids-Michael closes the door in Kay's face.

GF3-Michael finds out Zaza is dead-The ending sequence-Mcihael gets a stroke(so sad)-The confession.

*Trilogy*-Are you kidding me? Its like asking which one of my children I love more.

"I'd rather laugh with the sinners then cry with the saints, the sinners are much more fun."-Billy Joel