On the surface, CVS Caremark (NYSE:CVS) and Walgreen (NASDAQ:WBA) seem pretty similar. But dig deeper, and you see some big differences: CVS has a huge pharmacy benefit management (PBM) segment and has played more aggressively in retail clinics, while Walgreen's agreement with Alliance Boots (and potential buyout of the company next year) provides it with intriguing overseas growth opportunities. 

In the video below, from Where The Money Is, the Motley Fool's investment show, health care analysts Michael Douglass and David Williamson consider the best stock.

David Williamson has no position in any stocks mentioned. Michael Douglass has no position in any stocks mentioned. The Motley Fool recommends CVS Caremark. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.