Bayern might be a little more confident as well as Galatasaray who have a strong mentality after they were able to win over Manchester United, actually this is a match between two teams who have a chance of qualifying from this group, maybe they will have more motivation to be able to get points in the match This.
However, realistically, if we look at the quality of the two teams, of course Bayern is much stronger so I think they have a bigger chance of winning the match.
Apart from that the match will also take place at Galatasaray's home ground, making them even more motivated to beat Bayern Munich. Galatasaray also has several experienced players in the squad, Zaha will be a nightmare for the Bayern Munich defense if not closely guarded because he has good qualities when scoring goals. Bayern Munich must strengthen their defense if they don't want to lose their chance to get points because after all, Galatasaray will play attacking to get a quick goal at home.
The reason is that if you look at the match between Bayern Munich vs Manchester United, their defense was not very solid at all because even though they had a two goal lead in the first half. But in the second half Manchester United was able to get three goals back. This should be a special concern for Tuchel if he doesn't want a match like that to happen again, even though in the end he managed to secure full points.