Barcelona's defense is not enough strong. PSG can take advantage of this opportunity. If Mbappe and di Maria play well, they will be able to knock down the Barcelona defense. But if Neymar is in the team, the players are more cheerful and strong mentally. I'm not sure if Mbappe will be able to perform well without Neymar.
The group stage is always unpredictable! But I agree with you that PSG can easily beat Barcelona in the upcoming match... It's not the first time I notice that Barcelona have to win points in return matches...
looking at the current state of barcelona, i doubt that there are many people who believe that barcelona can win this game. but we cannot underestimate barcelona very much because PSG are another team that when the person thinks they will win easily they simply lose. if I bet on this game I prefer BTTS or over 2.5
usually in these parts of the cup I stop betting, because it becomes really difficult to win
I also avoid betting on who will win and I focus on the over or BTTS market