I've been a huge fan of both franchises since I was little, but I've always prefered the Alien. They're far more genuinely frightening, and the movies are to a higher standard (the first three, at least), along with a more involving story.

I also like the established cycle of the Aliens life, and the manner in which they reproduce, impregnating anyone or anything with facehuggers, ending with a visceral display as the main creature comes in to life.

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Adopted Bloodsport