Maybe because they are use to playing against each other more often in the Knockout stage always but we can still say that they are the strongest for now since they've been so tough to challenge and overcome in UCL..
Next season, the only way realmadrid can make a significant impact the more using Mbappe is by doing all balls for goal to mbappe which means Mbappe will be their main goal machine just like halland in Mancity
Real Madrid and Manchester City are the most favored teams based on the quality of their squad, especially Real Madrid who succeeded in bringing in Mbappe who will be plotted as a new goal machine. Mbappe joining Real Madrid will revive the competition between Haaland and Mbappe, their sharpness will be tested to become the top scorer and contribute to helping their team win the title. Support from his teammates is very necessary to make it easier for them to score goals, Mbappe might experience a few problems if Vinicius doesn't lower his ego in wanting to be the best player in the Real Madrid squad.