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.
Body Horror.
Things going wrong with the human body are viscerally frightening.
See: David Cronenberg
john carpenter’s ‘the thing’ paul verhoeven’s ‘total recall’ come to mind.