Better Dark Horse Weight Loss Drug Stock: Pfizer vs. Roche

Neither is a leader right now, but one of them might be on track to change that.Both Pfizer (PFE 0.88%) and Roche Holdings (RHHBY -0.18%) rank among the world's most powerful pharmaceutical companies. Yet neither is actively competing in the all-important market for weight loss drugs, which is currently being split between the likes of Novo Nordisk and Eli Lilly.Still, both have ongoing plans to develop weight loss pills. If those plans pan out, the returns are likely to be enormous. So which of these dark ...