The definitive ranking:

01. Psycho
02. Halloween
03. The Shining
04. Twin Peaks: Fire Walk with Me
05. The Texas Chainsaw Massacre (1974)
06. 28 Days Later
07. The Exorcist
08. It Follows
09. Rosemary's Baby
10. The Babadook

Texas Chainsaw Massacre, Nightmare on Elm Street and The Halloween Movies.

Also anything that has demons.

Wrong turn

My favourite horror movies are:

A Tale of Two Sisters
Tokyo Gore Police
Saw - Saw 3D
Scream Quadrilogy
Ringu
Ju-On: The Grudge
The Conjuring and The Conjuring 2
Rec Quadrilogy
Child's Play
A Nightmare on Elm Street
Halloween
Paranormal Activity
Scary Movie, 2, 3 and 4

I love the Saw series and the Final Destination series.

The Ring