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.
My favorite kind of comedy is a horror comedy! But none of those are really horrifying, they are using the horror as part of the punchline. Ready or Not and The Menu were two that I really enjoyed recently.
But my favorite kind of horror is body horror, especially if it has some kind of futuristic, alien, or supernatural effect. Something that is not part of our normal reality, possibly with menacing intent but also with something that is just doing its supernatural thing that ends up causing harm. I want horror to make me feel uneasy and full of dread in some way to find it horrifying, whether from cold and uncaring actions or the effects the thing has on the characters, as long as I am anticipating something wrong is going to happen and I am not sure what it will be. I especially love a dark or ambiguous ending!
Unfortunately this means most horror movies are enjoyable for the first two acts and then they often fall apart in the third act by either overexplaining or leaning too hard into jump scares. They lose the effect that not knowing brings, or introduce something that undermines what was causing the dread.