In the world we live in Nike is King. They control 40% of the market share and have the best athletes. After Adidas bought out Reebok they have actually lost market share. Recruits want Nike because their favorite players are wearing them, and they are simply better quality. Tennessee will recruit well either way, but Nike won't do anything but help us.
Tangent: Under Armour should not be considered by any school. Especially one that wants to remain competitive in basketball.