If we compare Real Madrid with PSG, maybe it is wrong because in terms of experience and quality, these two teams are different and Real Madrid has become the king of the Champions League. I am not so optimistic that PSG will be able to defend their second trophy in a row for next season because there are many challenges that they will get and also many teams are starting to fix their squads to look stronger when facing competition in the Champions League next season.
Yeah we can't judge PSG performance until they're in round of 16.
I'm pretty sure they will keep dominating in farmer league and in group phase, they're likely secure the place to qualify for round of 16. PSG and Real Madrid are different, if PSG qualify for round of 16, I don't think people automatically think they will able to defend the trophy.
Liverpool and Barcelona are still strong, they have a possibility to win.