Alien 2 is my choice.

It's always a toss-up between the first and second, isn't it. I'd say Aliens is my favorite, but it's a hair's breadth of difference. My actual controversial opinion is that *all* of the Alien movies are good (except AVP 2).

which Alien movie do you prefer? For me, the first one is best

I like horror with a touch of tongue in cheek, the Evil Dead trilogy, Braindead, Bad Taste etc.

In terms of sci-fi horror the 1st and 2nd Alien movies are pretty damn good.

I like pretty much any classic horror or sci fi

The Fog is great too. Forgot about that one.