Investors looking for stocks in the REIT and Equity Trust - Retail sector might want to consider either American Assets Trust (AAT) or Realty Income Corp. (O). But which of these two stocks is more attractive to value investors? We'll need to take a closer look to find out.There are plenty of strategies for discovering value stocks, but we have found that pairing a strong Zacks Rank with an impressive grade in the Value category of our Style Scores system produces the best returns. The proven Zacks Rank emphasizes companies with positive estimate revision trends, and our Style Scores highlight stocks with specific traits.Both American Assets Trust and Realty Income Corp. have a Zacks Rank of # 2 (Buy) right now. 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 piece of the puzzle 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.The Value category of the Style Scores system identifies undervalued companies by looking at a number of key metrics. These include the long-favored P/E ratio, P/S ratio, earnings yield, cash flow per share, and a variety of other fundamentals that help us determine a company's fair value.AAT currently has a forward P/E ratio of 11.61, while O has a forward P/E of 15.39. We also note that AAT has a PEG ratio of 1.45. 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. O currently has a PEG ratio of 3.89.Another notable valuation metric for AAT is its P/B ratio of 1.32. The P/B is a method of comparing a stock's market value to its book value, which is defined as total assets minus total liabilities. By comparison, O has a P/B of 1.37.These metrics, and several others, help AAT earn a Value grade of B, while O has been given a Value grade of D.Both AAT and O are impressive stocks with solid earnings outlooks, but based on these valuation figures, we feel that AAT is the superior value option right now. Just Released: Free Report Reveals Little-Known Strategies to Help Profit from the $30 Trillion Metaverse Boom It's undeniable. The metaverse is gaining steam every day. Just follow the money. Google. Microsoft. Adobe. Nike. Facebook even rebranded itself as Meta because Mark Zuckerberg believes the metaverse is the next iteration of the internet. The inevitable result? Many investors will get rich as the metaverse evolves. What do they know that you don't? They’re aware of the companies best poised to grow as the metaverse does. And in a new FREE report, Zacks is revealing those stocks to you. This week, you can download, The Metaverse - What is it? And How to Profit with These 5 Pioneering Stocks. It reveals specific stocks set to skyrocket as this emerging technology develops and expands. Don't miss your chance to access it for free with no obligation.>>Show me how I could profit from the metaverse!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 American Assets Trust, Inc. (AAT): Free Stock Analysis Report Realty Income Corporation (O): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research