Nike is boxey. UA is cut for athletic builds, and if you don't have that build, it makes you look better than you are.
As for originality, Nike has been well behind. UA developed the wick away stuff well before Nike. All of the variations, Nike has copied. Their hoodies are knock offs that UA has been doing for years. UA charged cotton has been copied by Nike now. How about how Nike has been pushing the camo stuff lately. UA was doing that at least five years ago.
Where Nike is still on point is in their shoes, though. Love their Frees.