So to say PSG are stronger seems wrong. If PSG are good, he's not in second place at the end of the group stage. They should be able to end up in number one like Madrid so the possibility of meeting in the first knockout phase.
But to say PSG is weak is also wrong. I think if they're right to meet in the first phase it's very interesting. It could be that it was a semi-final too early. Remember last season Madrid also struggled while playing in France, lucky Madrid were able to reverse the result at the Bernabeu.
Real Madrid and PSG in fact are both good in the Champions League this season because they qualified for the round of 16. What hasn't happened after this is just speculation and prediction, but if it is based on history then Real Madrid is always superior to teams that haven't even won a title.
PSG this season has been good because of the improved relationship between their three strikers namely Messi, Neymar and Mbaeppe. They advanced to the last 16 without defeat, but maybe not as good as Real Madrid's achievement, which managed to become the seeded team. Meanwhile, if these two teams meet in the last 16, then I think something that happened last season will be repeated because of the decisive round at home to Real Madrid as the seeded team.