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 gets under way with a tough matchup between AbbVie (ABBV -2.67%), Abbott's recently spun-off pharmaceutical division, and Big Pharma giant GlaxoSmithKline (GSK 0.08%). 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.