Brando: Streetcar, The Wild One
DiNeri: Raging Bull, Mean Streets, True Confessions
Pacino: Dog Day Afternoon, Scent of a Woman
Coppola: Apocalypse Now (and Redux)
You didn't ask, but I'd add Duvall for "True Confessions" and "Stalin," though he's such a great and versatile actor that it's hard to pick a "best."

Ntra la porta tua lu sangu � sparsu,
E nun me mporta si ce muoru accisu...
E s'iddu muoru e vaju mparadisu
Si nun ce truovo a ttia, mancu ce trasu.