It is not easy for psg in the Champions league. The champions league is the toughest league you can think of. PSG is leading the French league because their are no strong teams that can challenge PSG.
The champions has many strong teams competing to get the championship.
in the champions league, PSG is the favorite team to win, but seeing the quality of their performance in the last few matches, I doubt they will be able to win the champions league, the thing that really doesn't make sense to me is because they were beaten by Rennes twice this year just. that means rennes is a stronger team than PSG, totally unexpected.
They are the favorite team but in terms of percentage they are not more favorite than the other teams, like Bayern Munich who knocked them out, Manchester City and Real madrid, in my opinion. I see them relying solely on luck even with the star players in their squad. It may seem exaggerated when I say they only rely on luck, but that is a form of disappointment for them with a series of star players.