Investors interested in stocks from the Retail - Supermarkets sector have probably already heard of J. Sainsbury PLC (JSAIY) and Walmart (WMT) . But which of these two stocks presents investors with the better value opportunity right now? Let's take a closer look.There are plenty of strategies for discovering value stocks, but we have found that pairing a strong Zacks Rank with an impressive grade in the Value category of our Style Scores system produces the best returns. The proven Zacks Rank emphasizes co ...