One of the games that are difficult to predict who will win because both are great teams and they both have a winning mentality. If we look at their performance in their respective leagues, Chelsea is slightly better than Real Madrid, which they have always won in their last 5 matches, while Madrid won 4 times and in their last match they had to lose to Barcelona. In the first leg, I think Chelsea will be slightly above Real Madrid because they are playing at home.
The hosts' lead looks set to make Chelsea even more motivated to win the match against Real Madrid, but still I think the odds are 50:50 for them to qualify for the semifinals. In a few seasons the English team looks stronger in the Champions League where Chelsea, Liverpool, Manchester City can get into the semifinals and even the final. Real Madrid won't be my favorite this season considering they don't look ready for a stronger opponent when the intensity of the opponent's attack is better than theirs. Real Madrid's defense is not good, we can see in their last match vs Barcelona.