they are all good in their own rights.....i just like Alien and Alien Ressurection best. i have seen them all tho, my friend went out and got that Alien Quadrilogy boxed set and we watched em all over the weekend. each movie has a bonus material disc with it. then theres an extra disc with all kinds of stuff on it. its kool as hell. 🙂
I like the first one the best. You have to understand that back in it's day, no movie was made like that. It scared the hell out of people. Aliens was far more of a popcorn flick than the first, with the whole action movie paradigm and all. Alien 3 was my least favorite, I just thought it was boring. Alien 4 is my third favorite since I saw it in an altered state that left a lasting impression.
Now I have seen all four Alien films here are my opinion on all of them.
Alien: It started off the series and set the tone for what was going to come, personally it is my second favorite. I liked how the Alien was portrayed horrifically and how one could kill seven, this made it more terrifying.
Aliens: The best in the series IMO, it had more action and James Cameron really made Ripley evolve in this film. My favorite out of all the four films.
Alien 3: In my opinion this was the darkest film in the series. My third favourite. Again like Alien it showed how one Alien could kill loads of people which made it or the more terrifying like Alien.
Alien Resurrection: This for me was okay, IMO there were some good bits and bad bits, I personally think that the series should have ended with Alien 3. My fourth favourite.