Real Madrid has a Champions League match against Manchester City, in fact Manchester City has no chance of doing very well against Real Madrid in that match. Manchester City had a poor performance against Arsenal in the Premier League and if they go to Real Madrid with this performance I think they will have nothing but a big defeat there. The matches between Manchester City and Real Madrid in the previous two seasons have been much more interesting and when Real Madrid won one match Manchester City won the other but this season is unlikely to happen.
Manchester City may have to end their Champions League journey against Real Madrid as they cannot defeat Real Madrid. Most people will no doubt bet on Real Madrid in the match between Manchester City vs Real Madrid and I might do the same.
In history of Champions League, Real Madrid is a most successful club with 15 titles, and Manchester City has only 1 title.
https://en.wikipedia.org/wiki/UEFA_Champions_LeagueComparing Real Madrid and Manchester City in their past records and titles is very skewed to Real Madrid that is undoubtful a more succesful club than Manchester City.
Now comparing them in this season only, and in their forms recently, in my opinion Real Madrid are better than Manchester City too. The playoff draw result brings them together in a biggest clash in playoff stage, but with a big defeat of Manchester City by Arsenal in Premier League, Real Madrid can feel very happy and they actually see better chance to win this playoff pair eventually.