Very hard decision since Pacino's acting is excellent in any role. For me it was a toss-up between Scarface in which I thought he was fantastic, and Sonny from Dog Day Afternoon in which he brilliantly portrayed a likeable criminal. I went with Dog Day Afternoon because that's one of my favorite Pacino performances. I must mention also that I think his performance in Serprico was wonderful as well. As you can see, it was a difficult choice for me!!!