Investors looking for stocks in the Transportation - Equipment and Leasing sector might want to consider either Greenbrier Companies (GBX) or Westinghouse Air Brake Technologies (WAB) . 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 ret ...