Personally I love Scream. Big fan of comedy horror and every movie I enjoy.
Evil Dead is likely second and I love Chucky but that latest remake did not belong at all.
Alien is probably my favorite franchise and I’m excited about Noah Hawley’s (Legion, Fargo) new series this year.
Evil Dead and Chucky(even though some of the films are garbage) are also top favorites of mine. The TV series for both are very good.
Additionally, one that I really like that I don’t see mentioned often is [REC]. Spanish found footage zombie movies.
Hellraiser. Really only the first two (not counting the original black and white art experiment version, which is super cool).
The two that I always think first are Insidious and The Conjuring.
I don’t really enjoy horror but I think both of those are well done.