I am not into "gore porn" so i have never liked things like Saw. Not because it is sicking it is because once gore is in the picture too much the storyline is thrown out. I like movies with good, somewhat thrilling stories.
My favorites are 28 days/weeks later, most Gorgeo A Remro movies and the Zach Snyder Dawn of the dead.
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That depends on the horror genre.
But overall...
1. The Shining
2. Alien
3. The Silence of the Lambs
4. Psycho
5. The Exorcist
6. Jaws
7. The Thing
8. The Blair Witch Project
9. The Texas Chainsaw Massacre
10. The Omen