Investors looking for stocks in the Engineering - R and D Services sector might want to consider either M-tron Industries, Inc. (MPTI) or Howmet (HWM) . 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 Zacks Rank is a proven strat ...