At this time I would not let myself be carried away by the statistics, for me I think the winner will be Real Madrid, although Liverpool is literally flying, I think Real Madrid has a lot of experience in finals and above all they have a great technical director, in addition that Benzema can shine even more. Of course, not everything is written, Liverpool may give a surprise, in the PL they are having a very good season, both they and City are at the top.
You can not say no with statistics in sports. People in personal, face to face competition or tournament will be supported by their past win history against their opponents or be obsessed with their past defeats.
As a team, they will have tradition of the club, support of fans and some other things which will give them believe in themselves, strength to play better than what they can do. What Real Madrid have shown in Champions League this season is a very classic example on how a big and traditional winning club can achieve in their favorite league or tournament.
I see opponents of Real Madrid have some vague fear when they have to play against Madrid especially in Bernabeu. Moreover, if they have to hunt for Real Madrid, they turn to be very fearful.