Walmart hands down, I will NEVER preorder a game or try to pricematch/ad match from walmart ever, I'm not a masochist... *hiss*.
Just gotta say gamestop get's alot of flak, opened games as new, their stickers, huge profit margin's etc, gutting games. But hey, theres another side, their TiV's have actually been getting alot better with lot's of promo's, the occasional B2G1, 75% off GC games, the fact bestbuy gave crazy deals to compete. Heck, atleast their preorder system isn't broken like bestbuy's. I'd rather the evil I know than have... walmart...