Dead Space Extraction or Silent Hill???

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Silent Hill, far and away the best 3rd party game on the Wii.
http://www.giantbomb.com/quick-look-silent-hill-shattered-memories/17-1774/

Dead Space from what I understand is a run through once and done. I've gone through SH:SM twice, on my third run, and it's been different every time. This is definitely a game I'll be going back to from time to time.