Amensia is definitely more scary since it has more scary moments and doesn't really depends upon on audio effects
You've got to be kidding me! Or you haven't played it yet or left it half-way through.
Amnesia is one game where sound plays an important role to bring about the scare factor in the player and intensify it as the game progresses. There is no point in playing horror titles without audio. Heck, Amnesia's visuals were bad and the game largely relied on its sound effects. There was just one instance when a creature tries to scare you and you find a couple of those in the later levels.
Allwyn, I still urge you to grab a copy (< 1 GB IIRC) and play Amnesia. You don't have the slightest idea what the game has in store for you. Makes Dead Space, Resident Evil and Silent Hill franchises look like poosies! No kidding.