Having played both they are totally different experiences. Silent Hill games, at least the original games from team silent, are survival horror games on their own right. They are a very unique experience,not even replicated by the newer games in the series when the developers switched.
Didn't play AW2 yet but the first to me, felt like Uncharted with a different theme. Didn't experience a survival horror element but was atmospheric, like a Steven King novel based movie. AW1 was a linear experience going from point A to point B. Pretty much like Uncharted with a flashlight and supernatural entities instead of humans