I love the speech at the Commission meeting by Vito, though its not my favorite. I would have to say the one that ment the most to me was by Robert DeNiro when hes in his apartment with Tessio and Clemenza and explains how Fanucci had come to him asking for money. This is where he in my mind he starts to become the Godfather. Before he would listen to Clemenza and Tessio but here he takes over. Very much like how Michael gives that speech in the first one about killing Sollozzo and McClusky. These two scenes are great and are the stepping stones into why these two were such great Dons.