Investors with an interest in Oil and Gas - Production and Pipelines stocks have likely encountered both MPLX LP (MPLX) and Williams Companies, Inc. (The) (WMB) . But which of these two stocks is more attractive to value investors? We'll need to take a closer look to find out.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 compan ...