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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.
In the last few seasons, Barcelona has always lost against Bayer Munich both at home and away. However, if we refer to its historical records, Barcelona has always been able to beat Bayer Munich, especially when playing at home, but when playing at Bayer Munich's home ground, Barcelona has always struggled and has never won. This season may be a little different, Barcelona under new coach Hansi Flick has again performed impressively. I would certainly put Barcelona as the favorite to win the match against Bayer Munich, especially with the presence of Hansi Flick, who is a former Bayer Munich coach and he already understands Bayer Munich's playing culture very well, besides the match will be played at Barcelona's home ground.