For the game itself, there's no question: PCE version > US version all the way. The creators clearly put the white hockey mask for that "Jason" feel - it just doesn't work the same if the mask is red. And boo to the other censors as well.
But as for the ad, the US ver > JP version. It does a much better job of creating a tense atmosphere, which is a lot cooler than just random scenes from the game. And I didn't understand what the hell the girl was trying to say in the Japanese ad -- oddly enough, I had to read the Japanese subtitles to understand what she was saying in (strange) English!