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.
Even though the game will be played in Turkiye and the good performance shown by Galatasaray in this group stage but honestly I don't think they could get a chance vs Bayern Munich since we cannot compare them to Manchester United.
ManU isn't playing good in the latest games and they are doing a lot of mistakes at the opposite of Bayern Munich which look more consistent with Sane and Kane scoring in every match basically.
Even though this Champions League match against Galatasaray is in Turkey, I don't think home advantage will be a big factor for Bayern Munich. Bayern Munich are already favorites against Galatasaray and Bayern Munich will perform very well against this team be it at their home ground or away. Bayern Munich will definitely try to win this match by a big margin. Bayern Munich won the first two matches of the Champions League so they are sure of the next round and the third match they will only play for a win and the balance of the third match will not make much difference for Bayern Munich. While this match is not so important for Bayan Munich, this match is very important for Galatasaray as the performance of this match will determine whether they go to the next round or end their Champions League journey here.