Both teams have a dominant way of playing. Barcelona can be more favored, but I'm just worried about their defenders who I think are not very strong this season. There are still gaps even though in some matches it was closed by Barcelona's ability to dominate ball possession. But facing a strong opponent like Munich is clearly a tough test for Barcelona. It will not be easy to win the match. Before the match against Munich, Barca must face Sevilla who cannot be underestimated. Likewise, the match after facing Munich, Barca will face Madrid. They must be able to maintain their confidence.
I believe Barcelona will win against Bayern. Barcelona so far this season have 2 major problems. They keep a very high line that's difficult for opponents, but can be exploited by the opponents. When they play against very fast teams that have fast wingers, that high line can be a problem. most of the goals they've conceded this season came from a counter attack. If they can manage to keep the defense very aware of treats they can be lucky enough to win.
Seconly, they have to make use of their chances. Barcelona creates a lot of chances in each game, but they miss a lot of them too. Agaist a team like Bayern they might not be able to create many chances so they better score the ones they create.
I think I will put my bet on Barcelona, but it will be a very difficult match.