[Jeritron]

He got my vote. Love the Predator. It's a hard matchup, and it might seem obvious to pick the modern-day Grendel to Arnold Schwarzenegger's Beowulf. I mean that as more than an analogy. The films basically a dressed up and dressed down adaptation of the classic Beowulf story (and the best screen adaptation of it to date.)

Predator's a much cooler villain visually and in concept, but for the most part he's very simple. His strengths are aesthetic. It is really interesting that he is a silent stalker with some code of rules. He's tremendously frightening if you really think about it. It just felt right going with Cady, for depth. He's a more menacing and challenging villain.

He terrorizes a family right to the core. It's starts as harassment but evolves into mindfuckery on the deepest level, to a point where all three of them are probably scarred for life.
It calls into question some really disturbing stuff. One of them being that deep down Nick Nolte's wife wanted to fuck him for all the harm she brought to her husband. There's just a really interesting and disturbing examination of families and marriage in the subtext of that film.

I'm working purely from the Deniro version, and disregarding the Gregory Peck original (which is also a great movie).