The range of genres and subjects it can explore, the way it can tackle complex social issues, the way it provides a safe way to process identity and fear, the way it's always pushing art forward, the incredibly cool and unique creators it attracts.
Horror is the best!!
Dude have you seen The Kingdom (Netflix zombies in 16th century series via Korea)? If not: I give my highest recommendation. Delivers. Prob my fave zombie thing.