[Zero]

not sure what 'vs' means - i mean if i stick the three films into a steel cage for a grudge-match well. . . .to be honest. . . they would just sit there because they are inanimate objects.

if the question is which one do i like the best - the answer is probably Psycho.

If, on the other hand, you are asking which is the 'best' quality film - then the question is what does quality mean - is it pure technical brilliance (probably The Shining there) - is it 'scares' (probably the Exorcist on that one).

but, if it means the film that has had the most impact - then, hands down, it is Psycho - the single most important film in the history of American cinema. PERIOD!