My friends and I often debate this question. I tend to be more scared by human killers or monsters than can beaten, as I know there's at least some hope for the protagonists to overcome them. For example, films like The Strangers or The Descent feature these foes. Many of my friends think invincible creatures are scarier as there's nothing you can really do to stop them. Maybe placate or stall, but rarely beat. Most ghost and demon movies are example of this, like Paranormal Activity.
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