Investors looking for stocks in the Medical - Biomedical and Genetics sector might want to consider either Qiagen (QGEN) or Exact Sciences (EXAS) . But which of these two stocks presents investors with the better value opportunity right now? Let's take a closer look.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 ...