Samsung galaxy s3 vs nexus 4 which one should i buy if i can get them for the same price

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http://forums.androidcentral.com – Hi guys! I'm having trouble deciding which one should i buy, galaxy s3 or nexus 4 when I can get them for the same price which is about $300. both are brand new. I like a pure android (but not must), and i wonder if feature such as google now and those cards google said will learn what you usually do to give you the information you need automatically can be install on s3 I also like the fact that the nexus 4's cpu and gpu are stronger than that of galaxy s3, but because of various sources i'm very confuse of how much stronger nexus 4 is. I would like to keep my phone for about 2 years, (HowTos)