Investors interested in Banks - Foreign stocks are likely familiar with Barclays (BCS) and National Australia Bank Ltd. (NABZY). But which of these two stocks presents investors with the better value opportunity right now? Let's 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 Zacks Rank is a proven strategy that targets companies with positive earnings estimate revision trends, while our Style Scores work to grade companies based on specific traits.Currently, both Barclays and National Australia Bank Ltd. are holding a Zacks Rank of # 2 (Buy). This means that both companies have witnessed positive earnings estimate revisions, so investors should feel comfortable knowing that both of these stocks have an improving earnings outlook. However, value investors will care about much more than just this.Value investors are also interested in a number of tried-and-true valuation metrics that help show when a company is undervalued at its current share price levels.Our Value category highlights undervalued companies by looking at a variety of key metrics, including the popular P/E ratio, as well as the P/S ratio, earnings yield, cash flow per share, and a variety of other fundamentals that have been used by value investors for years.BCS currently has a forward P/E ratio of 6.04, while NABZY has a forward P/E of 14.22. We also note that BCS has a PEG ratio of 0.15. This metric is used similarly to the famous P/E ratio, but the PEG ratio also takes into account the stock's expected earnings growth rate. NABZY currently has a PEG ratio of 0.59.Another notable valuation metric for BCS is its P/B ratio of 0.48. Investors use the P/B ratio to look at a stock's market value versus its book value, which is defined as total assets minus total liabilities. By comparison, NABZY has a P/B of 1.44.These are just a few of the metrics contributing to BCS's Value grade of B and NABZY's Value grade of D.Both BCS and NABZY are impressive stocks with solid earnings outlooks, but based on these valuation figures, we feel that BCS is the superior value option right now. Tech IPOs With Massive Profit Potential In the past few years, many popular platforms and like Uber and Airbnb finally made their way to the public markets. But the biggest paydays came from lesser-known names. For example, electric carmaker X Peng shot up +299.4% in just 2 months. Think of it this way… If you had put $5,000 into XPEV at its IPO in September 2020, you could have cashed out with $19,970 in November. With record amounts of cash flooding into IPOs and a record-setting stock market, this year’s lineup could be even more lucrative.See Zacks Hottest Tech IPOs 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 Barclays PLC (BCS): Free Stock Analysis Report National Australia Bank Ltd. (NABZY): Free Stock Analysis Report To read this article on Zacks.com click here.