Investors with an interest in Electronics - Semiconductors stocks have likely encountered both GlobalFoundries Inc. (GFS) and Ambarella (AMBA). 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.GlobalFoundries Inc. has a Zacks Rank of #2 (Buy), while Ambarella has a Zacks Rank of #4 (Sell) right now. Investors should feel comfortable knowing that GFS likely has seen a stronger improvement to its earnings outlook than AMBA has recently. But this is only part of the picture for value investors.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 grades stocks based on a number of key metrics, including the tried-and-true P/E ratio, the P/S ratio, earnings yield, and cash flow per share, as well as a variety of other fundamentals that value investors frequently use.GFS currently has a forward P/E ratio of 22.50, while AMBA has a forward P/E of 68.46. We also note that GFS has a PEG ratio of 0.47. 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. AMBA currently has a PEG ratio of 7.68.Another notable valuation metric for GFS is its P/B ratio of 3.96. 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, AMBA has a P/B of 4.77.These are just a few of the metrics contributing to GFS's Value grade of B and AMBA's Value grade of F.GFS stands above AMBA thanks to its solid earnings outlook, and based on these valuation figures, we also feel that GFS is the superior value option right now. Zacks Names "Single Best Pick to Double" From thousands of stocks, 5 Zacks experts each have chosen their favorite to skyrocket +100% or more in months to come. From those 5, Director of Research Sheraz Mian hand-picks one to have the most explosive upside of all. It’s a little-known chemical company that’s up 65% over last year, yet still dirt cheap. With unrelenting demand, soaring 2022 earnings estimates, and $1.5 billion for repurchasing shares, retail investors could jump in at any time. This company could rival or surpass other recent Zacks’ Stocks Set to Double like Boston Beer Company which shot up +143.0% in little more than 9 months and NVIDIA which boomed +175.9% in one year.Free: See Our Top Stock and 4 Runners Up >>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 GlobalFoundries Inc. (GFS): Free Stock Analysis Report Ambarella, Inc. (AMBA): Free Stock Analysis ReportTo read this article on Zacks.com click here.Zacks Investment Research