Investors with an interest in Retail - Restaurants stocks have likely encountered both Bloomin' Brands (BLMN) and Starbucks (SBUX). 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.We have found that the best way to discover great value opportunities is to pair a strong Zacks Rank with a great grade in the Value category of our Style Scores system. The proven Zacks Rank emphasizes companies with positive estimate revision trends, and our Style Scores highlight stocks with specific traits.Right now, Bloomin' Brands is sporting a Zacks Rank of #2 (Buy), while Starbucks has a Zacks Rank of #3 (Hold). The Zacks Rank favors stocks that have recently seen positive revisions to their earnings estimates, so investors should rest assured that BLMN has an improving earnings outlook. But this is just one piece of the puzzle for value investors.Value investors also tend to look at a number of traditional, tried-and-true figures to help them find stocks that they believe are undervalued at their current share price levels.The Style Score Value grade factors in a variety of key fundamental metrics, including the popular P/E ratio, P/S ratio, earnings yield, cash flow per share, and a number of other key stats that are commonly used by value investors.BLMN currently has a forward P/E ratio of 12.36, while SBUX has a forward P/E of 24.58. We also note that BLMN has a PEG ratio of 1.31. This figure is similar to the commonly-used P/E ratio, with the PEG ratio also factoring in a company's expected earnings growth rate. SBUX currently has a PEG ratio of 1.82.Another notable valuation metric for BLMN is its P/B ratio of 27.63. The P/B ratio pits a stock's market value against its book value, which is defined as total assets minus total liabilities. For comparison, SBUX has a P/B of 74.49.These metrics, and several others, help BLMN earn a Value grade of A, while SBUX has been given a Value grade of C.BLMN sticks out from SBUX in both our Zacks Rank and Style Scores models, so value investors will likely feel that BLMN is the better option right now.Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report Bloomin' Brands, Inc. (BLMN): Free Stock Analysis Report Starbucks Corporation (SBUX): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research