Magmarock: People told me that Soma isn't that scary compared to outlast or Amneisa. I guess fear is subjective because I found this to be far more terrifying. [...] Amnesia never had this affect on me.
Same here, SOMA is way more atmospheric and terrifying to me than Amnesia. In the latter, you can't escape if an enemy has spotted you, so after a time, I didn't try anymore but waited for them to kill me – a very dull experience. Anmesia also doesn't have the variety of enemies that SOMA has, where every enemy is distinct up to the way they detect you (sight, sound …) Also, what scared me even more was the slowly growing knowledge how they became what they are now.
By the way, Frictional Games' older games Penumbra 1+2 are also very recommendable, and in my opinion they also beat Amnesia in terms of atmosphere and horror. If you didn't play them yet and you can stand their vintage technology (though I think they aged well), you may want to give them a try. This doesn't apply to Penumbra 3, which is only a kind of tech demo with physics puzzles and no story at all.