That's a tough one!
It's like trying to pick your favorite child!
Both Robert De Niro and Jack Nicholson have had long and illustrious careers, with numerous iconic performances.
De Niro is known for his intense, method-style acting, while Nicholson is often seen as the master of comedic roles.
Ultimately, it comes down to personal preference, but both actors have proven themselves to be masters of their craft.