Valencia are always tough rivals for Real Madrid. They often steal points from the Madrid side on Mestalla. Some time ago they took a fight against Barcelona and I think that they will organize themselves heavy against Real Madrid.
There is an open question with Rafael Benitez. Some players of the Royal club are waiting for the dismissal of their manager as some papers say. With all that said, I suggest to bet on Valencia’s win. Real Madrid will surely score, so the bet is Valencia to win and both teams to score.