I know Gamestop is going to win for the umpteenth time, but at least they have deals and actually have stock.
My vote is for Wal-Mart, especially after Black Friday this year. They had a ton of games on sale for some great prices but no one knew the entire list and most of the stores had little to no stock from beginning of the sale. There's no organization to the store and like someone else said, getting anyone to help you is a joke.