Kawasaki Ninja 150R vs Yamaha Vixion

Kawasaki Ninja 150R vs Yamaha Vixion, this is the question for me from my brother, i have one brother that at this time he want to buy motorcycle, but he is very confused because he have 2 motorcycle to choice, yeah Kawasaki Ninja 150R and Yamaha Vixion, who is the better? i don't know. But if you ask me about this, i will choice kawasaki ninja 150 r, why? because i know about engine kawasaki