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.
Most football fans assume like you, Bayern Munich will take home an easy win from Turkey. On the one hand, I also feel like your assumption because Bayern Munich is superior to Galatasaray. On the other hand, Galatasaray, who is very confident about the positive results achieved in the domestic league and the victory over Manchester United, will try to give a warm welcome to Bayern Munich in order to maintain their chances of qualifying for the next round. Anything could happen in the match, Bayern Munich could lose this match. Initial predictions can be wrong when the match starts, due to player injuries, red cards received by players and players not connecting well with each other.