Investors looking for stocks in the Financial - Investment Management sector might want to consider either AllianceBernstein (AB) or BlackRock (BLK) . But which of these two stocks presents investors with the better value opportunity right now? Let's take a closer look.We have found that the best way to discover great value opportunities is to pair a strong Zacks Rank with a great grade in the Value category of our Style Scores system. The Zacks Rank is a proven strategy that targets companies with positive ...