Barcelona can't even win against intermilan even played in home. That proves that if real madrid was superious from so many aspects. It seems like that bookmakers were drunk. The bookmakers are not even watching the result from last match against intermilan. they need to be at least watch the result from any match. It's strange to put more on barcelona.
I don't know about the bookmakers' alcohol preferences, but the bookmakers are clearly looking at the result of the Shakhtar-Real Madrid match, when Madrid barely saved a draw with great difficulty at the cost of a bloody face of Rüdiger at the 5th minute of the game 
Therefore, if I were you, I would be more cautious about the chances of the teams in the upcoming El Classico. For me personally, Real Madrid is also a favorite in the upcoming match with Barcelona, but only on the basis that the match will be held at Real Madrid's home stadium. By the way, Benzema does not seem to be in the best shape yet and has not scored goals in the last two matches, unlike the same Lewandowski, who scored two goals for Inter and almost saved the match for Barcelona and kept the chances of getting out of the Champions League group stage into the playoffs.