Monster has amazing highs ("Codeine Crazy" / "F*ck Up Some Commas" / "Hardly") but is scattered to me. 56 Nights is dope from beginning to end, even though its criminally short.
Dirty Sprite 2 is immaculate, though. "Thought It Was a Drought", with those ominous first notes, is one of the most appropriate intros ever -- it lets you know from start, this is going to be an hour* of dark, drugged, nihilistic and amazing music.
thematically it's the tightest of his projects, aurally it's the most cohesive, and lyrically it's some of his best lines and hooks ("Slave Master" is Future's whole ethos). I love with everything Future has made in the last year, but DS2 is forever his magnum opus to me.