In honor of March Madness, the Motley Fool's health-care team assembled their own bracket consisting of the 16 largest and best pharmaceutical and biotech stocks on the market. The series kicks off with a tough matchup between two of the biggest players in the diabetes space: Sanofi (SNY 1.21%) and Eli Lilly (LLY -1.50%). To learn the bull and bear cases for each stock -- and to see which stock will move on to the Elite Eight -- watch the following video.