From what I've seen of both games Alien Isolation overall was better. I think Alien Isolation had just the right amount of gunplay to make make ir scary enough and more about using survival instincts to get through the game whereas it felt like the Evil within had a little too much weaponry to make it feel like you were helpless. In Alien Isolation the AI can be buggy at times where the Alien or other hostile mobs could walk right by you and and not see or attack you. I have to say the sound effects, music and some of the space visuals were some of the best I've ever seen/heard in a game. Whoever did the sound and voice acting work in Alien Isolation did an excellent job.