In the contrast of midfield, Real Madrid has Kaka, Cristiano Ronaldo, Alonso and others, while Barcelona has Xiaobai and Xavi, which can be described as a tie. Personally, I think that Real Madrid's midfield attack is strong, Barcelona's series is good, and Real Madrid is slightly better.
Speaking of defenders, Barcelona can be said to stand out from the crowd. Pique, Alves, Albeitel and the captain of Barcelona are all very good. On the other hand, Real Madrid has a slight gap.
On the whole, I voted for Barcelona.