I think this is very factual, even with the presence of their star players psg hasn't maintained a good performance like this in a long time.. it's hard to predict who's gonna win the champions league this season... psg's current performance is absolutely spectacular but inter Milan has more drive and motivation compared to them... it's a hard one to decide but if these two teams play against each other I'm placing my bet on inter.
I think BTTS also looks quite good, both teams seem capable of scoring. Inter Milan attack is very unpredictable, and we've seen how they eliminated Barcelona. PSG, with players like Dembele and Kvaratskhelia, looks more organized, their attacking patterns will rely on these two players. Regarding motivation, PSG actually has much greater motivation than Inter Milan, considering they have never won the Champions League trophy in the club history.