Investors with an interest in Financial Transaction Services stocks have likely encountered both Global Payments (GPN) and MasterCard (MA) . But which of these two companies is the best option for those looking for undervalued stocks? Let's take a closer look. The best way to find great value stocks is to pair a strong Zacks Rank with an impressive grade in the Value category of our Style Scores system. The Zacks Rank favors stocks with strong earnings estimate revision trends, and our Style Scores highligh ...