What's Better, Nike or Under Armour?

Under Armour's stock is running away with the ball this year. But betting on this fast break stock is definitely a Hail Mary play.

Investors are favoring Under Armour over Nike in the battle for athletic wear. Shares of Under Armour are up 54 percent this year, while Nike's stock is up just 3.8 percent. Why? Under Armour's rapid growth is big draw. Under Armour is expected to post 25 percent higher adjusted earnings this fiscal year, well above the 13.8 percent growth expected from Nike, says S&P Capital IQ.