Investors with an interest in Transportation - Truck stocks have likely encountered both Knight-Swift Transportation Holdings (KNX) and Saia (SAIA). But which of these two stocks presents investors with the better value opportunity right now? Let's take a closer look.The best way to find great value stocks is to pair a strong Zacks Rank with an impressive grade in the Value category of our Style Scores system. The Zacks Rank favors stocks with strong earnings estimate revision trends, and our Style Scores highlight companies with specific traits.Both Knight-Swift Transportation Holdings and Saia have a Zacks Rank of # 1 (Strong Buy) right now. 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. But this is just one factor that value investors are interested in.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.KNX currently has a forward P/E ratio of 12.74, while SAIA has a forward P/E of 37.19. We also note that KNX has a PEG ratio of 0.85. This popular figure is similar to the widely-used P/E ratio, but the PEG ratio also considers a company's expected EPS growth rate. SAIA currently has a PEG ratio of 1.05.Another notable valuation metric for KNX is its P/B ratio of 1.52. 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, SAIA has a P/B of 7.89.These are just a few of the metrics contributing to KNX's Value grade of B and SAIA's Value grade of F.Both KNX and SAIA are impressive stocks with solid earnings outlooks, but based on these valuation figures, we feel that KNX is the superior value option right now. Bitcoin, Like the Internet Itself, Could Change Everything Blockchain and cryptocurrency has sparked one of the most exciting discussion topics of a generation. Some call it the “Internet of Money” and predict it could change the way money works forever. If true, it could do to banks what Netflix did to Blockbuster and Amazon did to Sears. Experts agree we’re still in the early stages of this technology, and as it grows, it will create several investing opportunities. Zacks’ has just revealed 3 companies that can help investors capitalize on the explosive profit potential of Bitcoin and the other cryptocurrencies with significantly less volatility than buying them directly. See 3 crypto-related stocks 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 KnightSwift Transportation Holdings Inc. (KNX): Free Stock Analysis Report Saia, Inc. (SAIA): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research