Investors interested in Transportation - Truck stocks are likely familiar with ArcBest (ARCB) and Landstar System (LSTR). But which of these two stocks offers value investors a better bang for their buck right now? We'll need to 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 proven Zacks Rank puts an emphasis on earnings estimates and estimate revisions, while our Style Scores work to identify stocks with specific traits.Right now, both ArcBest and Landstar System are sporting a Zacks Rank of # 1 (Strong Buy). This system places an emphasis on companies that have seen positive earnings estimate revisions, so investors should feel comfortable knowing that these stocks have improving earnings outlooks. 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.ARCB currently has a forward P/E ratio of 15.56, while LSTR has a forward P/E of 29.58. We also note that ARCB has a PEG ratio of 1.56. 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. LSTR currently has a PEG ratio of 2.46.Another notable valuation metric for ARCB is its P/B ratio of 1.15. 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, LSTR has a P/B of 7.84.These metrics, and several others, help ARCB earn a Value grade of A, while LSTR has been given a Value grade of C.Both ARCB and LSTR are impressive stocks with solid earnings outlooks, but based on these valuation figures, we feel that ARCB 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 ArcBest Corporation (ARCB): Free Stock Analysis Report Landstar System, Inc. (LSTR): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research