Many people like you think Real Madrid is stronger than Barcelona and they can have more chance for the champions league because of the more money they invested there and the more and better player they bought this season like Jude Bellingham and they are even close to buying Mbappe while Barcelona is not in the good financial situation but I think this can price anything because, in the recent friendly match, Barcelona won the game and beat Real Madrid.
Right now predicting about any club is surely not easy because many changes are still occurring in clubs and few changes surely can change the momentum of any team as things going right now on papers Barcelona is still stronger but if we have Mbappé into Real Madrid then surely they could on their best for the another double with they already have few good players which can give them good start and better result in coming season Barcelona is also now doing good things for the keeping their momentum which is also important for them if they want to defend their title.
Recently we have few friendly matches which are under talk with their results, but these are surely just for the practice and keeping things in better way with real competition is now just few days away, and we can expect tough competition which will give better view about who is going to have better end of the next season but in next few days all will be clear how things will be settled.