Personally, I love horror comedy. I find a good one endlessly rewatchable. Cabin in the Woods, Return of the Living Dead, Tucker & Dale, Scream, frigging Killer Klowns from Outer Space! Definitely my favorite.
Otherwise I’m really into paranormal & zombie horror. I think that would make up my top three. Fast > slow zombies.
ambient. one that makes you think it is there but isn’t. generally not a monster but a situation slowly spiralling out of control.
imo, part of the scare is the impending danger and the signs that it will catch up to the main characters. bonus points if the characters try to fight it with a bad decision.