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!!!
"Mankind must put an end to war before war puts an end to mankind. War will exist until that distant day when the conscientious objector enjoys the same reputation and prestige that the warrior does today." JFK
I went with Dog Day Afternoon because that's one of my favorite Pacino performances. 
