Investors interested in stocks from the Retail - Discount Stores sector have probably already heard of Ross Stores (ROST) and Costco (COST) . But which of these two stocks offers value investors a better bang for their buck right now? We'll need to take a closer look.The best way to find great value stocks is to pair a strong Zacks Rank with an impressive grade in the Value category of our Style Scores system. The Zacks Rank favors stocks with strong earnings estimate revision trends, and our Style Scores h ...