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I would choose to be stuck on a space station with a xenomorph because then i would hide as much as possible, while being chased by an unstoppable monster(s)

I'd have to go with the Predator. If I have no weapons chances are he'll leave me alone.

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^Either way, if the Predator decides to kill you, it'd probably be quicker and hurt less than if a Xenomorph decided to.