Both PSG and Bayern Munich are big teams in their respective leagues, and they both are at the top of the standings for the time being, so it's hard to predict which of them will be the winner. If we see PSG with all their glamour, I think they will be favorites in the first leg (moreover they will be playing at home). However, the effectiveness of the Bayern Munich players cannot be underestimated either because they are a good team after all and they have the capability to beat PSG.
Yes you are right, but because the round of 16 will soon be held. this situation is actually more difficult for Bayern Munich, who are experiencing some problems in their team. several players were injured, and the lack of preparation for a series of friendly matches during the league break caused their performance to suffer a bit and one of the causes of the problem was the team's overall fitness. we can refer to their three matches in the Domestic League, in three of their matches Bayern only got a draw. Of course, this created a bit of a problem for Nageslemann when he faced PSG later. the reason is, PSG is not Barcelona which they easily toppled.
On the other hand, PSG's performance has also not been impressive and several of their players are still injured. however, Galtier's starting squad have been confirmed to be in tip-top shape. IMO, at least PSG has the advantage of playing in the first leg and taking advantage of the momentum of Bayern's condition which is not at its best. but, sometimes Bayern Munich often surprises us with the actions of its players who play very solidly and brilliantly. there are no other words, other than just waiting for this fight to be held soon.