Compared to Arsenal and Barcelona, I prefer Bayern Munich because even though they don't have an experienced coach, their mentality and experience have been tested enough. Leverkusen is not at that level because they are not a seeded team even though they played quite consistently last season. The Champions League is different and there are many clubs that might be favored but ultimately fail to advance to the next round.
Next season will also be very different in the Champions League because it is possible that your favorite team will not be able to advance to a fairly crucial round next season, although Bayern Munich players still have a better mentality when playing in the Champions League. But as long as there is Real Madrid and also several teams whose strengths can be quite balanced, it will always be more difficult to place a certain team to become champions and also to be able to advance to more rounds in the Champions League next season.