It depends of what kind of spectator you are, some people barely get themself into the movies and they need a superficial terror, like the classics jumpscares, the music gettind loud suddlenly and things like that to scare them, and those tricks are already too used and does not have effect for other kind of people.
On the other hand there are people that get too much into the films and psychologic terror affects them a lot, I was genuinely scared watching The Babadook and It Follows, they were in my head for weeks, the same happens with some older movies like Rosemary's Baby, yet I know there are a ton of people that feel absolutely nothing watching them.
Personally I think the movie that scared me the most was The Ring, is not my favourite terror movie at all, but holy shit, it gets under your skin.