American Eagle Outfitters shares have gained an impressive 28% in the past six months. On the other hand, Abercrombie & Fitch shares have dropped 18.2% during that span. How could two companies that sell apparel to teens, and are competing with H&M and Forever 21, have two such opposing stock price performances? The answer is that American Eagle Outfitters is showing that it's changing how it does business. American Eagle has managed its inventory very conservatively, helping to minimize markdown risk. More stylish items are in the assortment for boys and girls. Abercrombie & Fitch, on the other hand, largely remains true to its insular culture, not offering consumers enough fashionable choices at reasonable prices. TheStreet's Brian Sozzi reports.