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Unlike Barcelona with Xavi, Bayern Munich still have to prove themselves internationally with Kompany. Sure, they won their first game with 9 goals, but their opponents were also very weak. They've already lost to a slightly stronger opponent like Aston Villa, so for me Barcelona is the clear favorite in this clash.
You may be right with your analysis, but I doubt it based on the meeting record of the two teams. Barcelona is poor in terms of its meeting record with Bayern Munich both in home and away matches, but something different can always be expected every time the season changes and so does the coach.
Bayern Munich and Barcelona are in fact two good teams so far this season in their respective leagues, but both teams have also suffered one defeat each in the Champions League so far. Barcelona surprisingly lost to Monaco, while Bayern Munich lost to Aston Villa. I don't want to put Barcelona as favorites for the reasons I've already said, but I'd definitely be happy if they improved their record.
Barcelona's defeat against Monaco was because Barcelona played with only 10 players since the first half in the 11th minute, but despite this, Barcelona still managed to equalize the score to 1-1 at half time, although in the end Barcelona still lost by a score of 2-1. But about Bayern Munich who lost against Aston Villa, the fact is that Bayern Munich had a very high dominance in the match, but Bayern Munich got a deadlock until they were unable to make a goal and Bayern Munich lost against Aston Villa.
In addition, considering the head to head results or history of Barcelona v Bayern Munich meetings I think it is not so appropriate, at least for this moment. Because after all, Barcelona under Hansi Flick is an experienced coach and in fact, Hansi Flick has success with Bayern Munich before. But for Kompany, basically Kompany is also new to being a coach in a big team like Bayern Munich and also, during Kompany's coaching career that he has no experience for competition in the Champion League. With such differentiating factors, I personally believe that Barcelona will still have a better chance than Bayern Munich.