Comeds
Unreliable Narrator.
Both have been terrific in their good roles but Pacino has been laughably terrible in a few. Bad De Niro is when he just half-asses it. Bad Pacino is unwatchable.
Thats the way I feel. Both actors at their best I think this question would be a tough one but to me in so many roles Pacino has way overacted - almost to the point of him being a caricature of himself.