Over the past few years, Under Armour (NYSE: UAA) (NYSE: UA) was considered the hot growth stock in sportswear and footwear, while Adidas (NASDAQOTH: ADDYY) was frequently dismissed as a “mature” play with limited growth potential. But over the past 12 months, the tables abruptly turned — Under Armour stock plunged more than 50%, while Adidas rallied over 50%. Let’s take a look at how these companies’ growth trajectories reversed, and whether or not one stock is now a better long-term play than the other.