Biogen Inc. (NASDAQ: BIIB) and Amgen Inc. (NASDAQ: AMGN) are two of the biotech industry's oldest players, with long, successful track records. While they have a lot in common, the opportunities and challenges they face aren't the same.Which of these large-cap biotech stocks is better positioned to deliver big gains? Here's how Amgen and Biogen stack up against each other.Image source: Getty Images.Continue reading