Nice avatar, Lamanai! It made me
!
I think it would be hard to adapt any of the games to a movie and still keep all the important story parts. PS1 would be the easiest to do that with, so I would start there. It would need a lot of computer generated sci-fi backgrounds in the towns and spaceships to offset the fantasy side.
PS4 would work best as a TV show or a series of movies, maybe a trilogy. It does have the most story, but that means a two hour movie would have to cut a lot of stuff out to get Chaz from rookie Hunter to Hero. If it were a trilogy, the first part could be about getting through Zio & Kuran, the second about Dezoris, and the third about Rykros and the final battle. That lets the first two movies end with a Dark Force. The third can start with Seth and end like the game.