It's fun to read takes on the Alien series. Each of the four films is helmed by a distinct director, so there's lots of room for playing favorites. I watched the movies one after the other not long ago and had a great time. I like them as a set.
Scott) - 1979
Cameron) - 1986
Fincher) - 1992
Jeunet) - 1997
And, of course, what holds everything together is the magnificent Sigourney Weaver.