Google play edition one is unlocked and has stock android, which will get rather timely updates from Google. At&t version (as with all other versions) have the touchwiz skin overlay, which give you the eye features and such. Check out videos for both and see which one you like, however remember that the GPE is purchased off contract for ~$650 I think.
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-Samsung Galaxy S4 Black Mist AT&T (SGH-i337) STOCK 4.4.2 (NB1)
-Samsung Galaxy S3 Marble White AT&T (SGH-i747) (CM10.1.0) (Currently dead)