Cramer said he prefers Nike as it's a juggernaut even though it's barely up today.
Under Armour shares are trading higher after Argus upgraded the stock from Hold to Buy and announced a $20 price target.
Under Armour's stock was trading up 3.73% at $16.70 per share at the time of publication. The company has a 52-week high of $21.96 and a 52-week low of $7.15.
Nike's stock was trading up 0.55% at $132.91 per share. The company has a 52-week high of $136.35 and a 52-week low of $60.