I thought about it and still I can't choose. I think my favorite scene the Godfather part 1 I'll go for the opening scene with Bonasera, when Luca Brasi wants to see Vito and the speech of Vito at the meeting with the heads of all the families. In the Godfather 2 it would be the scene with Young Vito and the landlord Roberto, but I also like the scene when Franky Pentangeli wants to hear the Tarantella and his meeting with Micheal and tells him he wants the Rosato brothers dead.

But when I watch the movies again, I think it will probably be other scenes again.