Bayern is not doing well in the Bundesliga, while Arsenal is doing better.
This is exactly correct, if you take a look at the head to head between the two team, Bayern have won far more games and if we are to predict this game using that, then the advantage is with Bayern Munich. Having said that, Arsenal have improved greatly since the last time they met Bayern, and even though it sounds strange to say, they (Arsenal) are the favorites in this tie as they have the quality to eliminate Bayern Munich.