Investors interested in stocks from the Building Products - Home Builders sector have probably already heard of PulteGroup (PHM) and NVR (NVR). 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 Zacks Rank favors stocks with strong earnings estimate revision trends, and our Style Scores highlight companies with specific traits.Right now, both PulteGroup and NVR are sporting a Zacks Rank of # 1 (Strong Buy). The Zacks Rank favors stocks that have recently seen positive revisions to their earnings estimates, so investors should rest assured that both of these companies have improving earnings outlooks. However, value investors will care about much more than just this.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.PHM currently has a forward P/E ratio of 9.17, while NVR has a forward P/E of 18.29. We also note that PHM has a PEG ratio of 0.62. This popular metric is similar to the widely-known P/E ratio, with the difference being that the PEG ratio also takes into account the company's expected earnings growth rate. NVR currently has a PEG ratio of 1.41.Another notable valuation metric for PHM is its P/B ratio of 1.94. 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, NVR has a P/B of 5.32.Based on these metrics and many more, PHM holds a Value grade of B, while NVR has a Value grade of D.Both PHM and NVR are impressive stocks with solid earnings outlooks, but based on these valuation figures, we feel that PHM is the superior value 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 PulteGroup, Inc. (PHM): Free Stock Analysis Report NVR, Inc. (NVR): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research