Currently it is only Manchester City and Real Madrid that is the strongest in UCL, and it is only Manchester city that is Real Madrid rival. Any club that is in its best form has the chance of winning UCL that season. This was what happened when Chelsea won UCL. However, luck is also part of succuss because if you are not lucky, you will not be able to overcome tough clubs like Real Madrid.
Next season will favor Real Madrid more only if City can stop them but I doubt this can happen because scoring goals would not be a problem for Real Madrid anymore now that they got Mbappe as their number 9 striker, he will be scoring very easy because he will have all the assist he needs.
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)
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