If Real Madrid can play with full team and Benzema has no bad issue (injured), I also think that Real Madrid has a bigger chance to win. Benzema looks to play better than Lewandowski, and other Real Madrid attackers look more productive than Barcelona attackers (scored more goals). In this matter, we can assume that Real Madrid has a better attacking line. For midfielders, I also think that Real Madrid is better than Barcelona. It is only about the defenders, if Real Madrid defenders perform well, Real Madrid should defeat Barcelona. In the previous match, Real Madrid defenders played under performance.
Yes, even though they are superior, there is no guarantee for Barcelona to beat Real Madrid again. Real Madrid visited Camp Nou with high ambitions to steal victory and qualify for the final. Carlo Ancelotti is aware that only the Copa Del Rey is the only domestic title his team has the chance to win, because for the La Liga title it seems that hope is very slim. Xavi certainly has to be wary of the drums of war that Benzema and friends are beating, because Real Madrid has good capital after winning a landslide victory over Valladolid.