I consider Kubrick the best director and A Clockwork Orange his best movie, so for long time I would've said that.
Another top one is Blade Runner, though that has the problem that it's the 90's Director's Cut (and later version) that is the great masterpiece, not the original version.
And yet further candidates for GOAT include Das Boot, Sunset Boulevard, Cabinet of Dr. Caligari, LA Confidential, M, Snatch and obvious ones like Godfather and Shawshank Redemption.
But to name just one as the absolute greatest film of all time, I choose Once Upon a Time in the West.
Building on the Dollar trilogy (which themselves are among the greatest ever), it is the peak of cinematography, sound design, casting and overall storytelling.







