Halloween is my favorite. It was amazingly well done for it’s time, and holds up extremely well. The opening scene is absolutely incredible, and the killer having free reign throughout the neighborhood, regardless of time of day, is creepy as hell. Also the music is amazing.
Scream is also a really well done movie, and would be up there for me. To me, it follows a very similar theme as Halloween, and the fact it’s made so literally everyone could be the suspect is great. The comedic timing is also well done. When you find out there are 2 killers? That, to my knowledge, had never been done before.