Investors with an interest in Engineering - R and D Services stocks have likely encountered both M-tron Industries, Inc. (MPTI) and Alfa Laval AB Unsponsored ADR (ALFVY) . 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.We have found that the best way to discover great value opportunities is to pair a strong Zacks Rank with a great grade in the Value category of our Style Scores system. The Zacks Rank is a proven strategy that tar ...