Indeed, in the end this goes back to what scheme they apply in this match whether Galatasaray will try to keep up with the game Bayern is doing in this match or not because everything has a risk I think.
But it would be better if Galatasaray tried to match the intensity of Bayern with a fast game than using a defense scheme but indeed this would be more draining but the results could be more benchmarked.
Copenhagen did the same thing before and they managed to hold Bayern just that lack of focus in the crucial minutes made them have to give up 1 point in the last minutes. Galatasaray can also try that, it's just that the risk is clear when trying to keep up but it doesn't go well then this can backfire for Galatasaray itself.
This time everything is against Galatasaray and they can't have any chance against Bayern Munich because normally Galatasaray don't have enough power to stand against Bayern Munich and the players they have but the difference in this game for Galatasaray is they don't have Mauro Icardi because he is injured and this can definitely damage the team.

I didn't know Icardi was injured because I don't really follow the Turkish Super Lig league but what I do know is that right now the hurricane of injuries is actually at Bayern.
Against Mainz a few days ago Goretzka suffered a problem in their hands and must miss the next few matches and indirectly this adds to the list of injured players as we know that previously Neuer, Gnabry, Mazraoui, Raphael Guerreiro and Upamecano previously had to pull over due to injury.
Even so, I still believe in Bayern even with the current conditions, it's just that the condition of some of the defenders in trouble is a little troublesome.
Of course, Bayern Munich's squad quality is better than Galatasaray. In Galatasaray, even if Icardi is on the field, he may not pull a rabbit out of his hat. So let's not expect extraordinary performance from him. Bayern have not lost in the group stages for 36 matches. If Galatasaray achieves this, it will be a magnificent success.