I don't think that this is a productive thing to measure because I don't think that "Who has the better film tradition, the East or the West?" is a useful question. I don't claim to know which one is better. But I will indulge you.
According to the
BFI's list of top films of all time as ranked by critics, the Soviet film
Man with a Movie Camera is the #9 best film in the world.
They asked the same question to a group of directors and according to them the highest ranking Soviet film is
Mirror at #8. If we go by simplistic rankings of "Which group had more films make the list?" then obviously the west wins, as the critics' #1 film is
Jeanne Dielman, 23 Quai du Commerce, 1080 Bruxelles (which is French) and the directors' #1 film is
2001: A Space Odyssey.
However, the fact that the Soviets have a consistent showing on both of these lists shows that they have made significant contributions to the medium. These are clearly films that critics compare other films to, films that inspire directors across the globe. The idea that the Soviet Union was artistically bankrupt is utter poppycock.