I'm sorry, but there is peer-reviewed scientific proof that "Aliens" and "didn't enjoy that much" do not belong in the same sentence.

That said, I still prefer Alien by a nose, purely because I'm such a horror fan, and Aliens is more of an action film. But make no mistake: both are brilliant, both are classics, and both will never be topped. (I refuse to acknowledge the existence of any sequels beyond the first two. They are like disowned children who disgraced the family name.)