Investors looking for stocks in the Retail - Apparel and Shoes sector might want to consider either Zumiez (ZUMZ) or Boot Barn (BOOT). But which of these two stocks presents investors with the better value opportunity right now? Let's take a closer look.Everyone has their own methods for finding great value opportunities, but our model includes pairing an impressive grade in the Value category of our Style Scores system with a strong Zacks Rank. The proven Zacks Rank emphasizes companies with positive estimate revision trends, and our Style Scores highlight stocks with specific traits.Right now, Zumiez is sporting a Zacks Rank of #2 (Buy), while Boot Barn has a Zacks Rank of #3 (Hold). This system places an emphasis on companies that have seen positive earnings estimate revisions, so investors should feel comfortable knowing that ZUMZ is likely seeing its earnings outlook improve to a greater extent. But this is just one piece of the puzzle for value investors.Value investors also try to analyze a wide range of traditional figures and metrics to help determine whether a company is undervalued at its current share price levels.The Value category of the Style Scores system identifies undervalued companies by looking at a number of key metrics. These include the long-favored P/E ratio, P/S ratio, earnings yield, cash flow per share, and a variety of other fundamentals that help us determine a company's fair value.ZUMZ currently has a forward P/E ratio of 10.09, while BOOT has a forward P/E of 18.82. We also note that ZUMZ has a PEG ratio of 0.75. 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. BOOT currently has a PEG ratio of 1.11.Another notable valuation metric for ZUMZ is its P/B ratio of 1.19. The P/B ratio is used to compare a stock's market value with its book value, which is defined as total assets minus total liabilities. For comparison, BOOT has a P/B of 3.03.Based on these metrics and many more, ZUMZ holds a Value grade of A, while BOOT has a Value grade of C.ZUMZ sticks out from BOOT in both our Zacks Rank and Style Scores models, so value investors will likely feel that ZUMZ 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 Zumiez Inc. (ZUMZ): Free Stock Analysis Report Boot Barn Holdings, Inc. (BOOT): Free Stock Analysis Report To read this article on Zacks.com click here.