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.
Science Fiction horror. There are so few movies that do it right. I don’t want to see a goofy monster chasing people around a ship. I want to feel the dread and helplessness of being isolated in the emptiness of space and having to deal with some unknown horror. A big part of the fun is the mystery and the endless possibilities.
I love a good science fiction that’s just beyond reality. Things that could actually happen in the real world with a not-too-unlikely dice roll.
The Last Of Us for example: a known, real-world fungal spore that takes over its hosts body (ants) and uses it to attack and spread to other potential hosts; mutates to survive earth’s rising temperatures allowing it to survive in and control larger warm-blooded hosts (humans).
Thus, real zombies that aren’t the result of some total fantasy fabricated in a lab that fucked up somewhere.
It’s more believable making the fear more real.