Which Observation duty game is the best?

[Cam]

Wanted to gift my gf one of the games as she's took an interest in the genre after seeing me play Dead Signal. Obviously observation duty is a lot less Jumpscarey so it'd be more suitable for her as she gets scared easily. So which one would you recommend as a good first impression.
Tyy

[Beef]

5 and 6 have more content than the earlier entries, so I'd say with one of those.