Investors looking for stocks in the Medical - Products sector might want to consider either National Vision (EYE) or Insulet (PODD) . But which of these two stocks presents investors with the better value opportunity right now? Let's take a closer look.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 companies with positive estima ...