I don't want to spoil the list here -- which is damned good by my estimation -- so go take a long peek at it. I'll just "tease" the results here with some of the "stats" on the list that Vault of Horror has assembled.
No movie in the top 12 was made in the last 25 years.
No movie in the top 14 was made in the last 10 years.
Only one movie in the top 26 was made in the last 20 years.
Four of the top 10, and 3 of the top 5, were made in the 1970s.
Directors listed most times: John Carpenter & Tobe Hooper (3).
Three silent films.
One TV movie.
Two non-feature length films.
Two great films that didn't make this top fifty list but which I esteem rather highly are Don't Look Now (1973) and Picnic at Hanging Rock (1975). But I just don't see much to quibble with here. (Except number 38 on the list, which I must disavow: I didn't vote for it...)
Regardless, it was a great honor to be involved in the polling on this list, and I applaud all the effort, time and energy that Vault of Horror put into wrangling it!