That's a very natural thing, I also think that at the end of the competition it is always Bayern Munich who won the German league trophy. Because in terms of struggle and consistency, Bayern Munich players are always better than Dortmund, although the Dortmund team's overall game is not so bad because Dortmund can also compete for the German league trophy.
No doubt what ever hard competition always Bayern Munich is the winner on Bundesliga and they have bigger chance how keep consistent get trophy every season, I think with completed team and always dominance on every match no doubt keep favorite on the first list with Bayern Munich as close team with Bundesliga trophy next season, looking on transfer activities only Bayern Munich serious how to get star player like Sadio Mane, maybe Dortmund and Leipzig could be team will give fighting for Bayern Munich to get trophy, but looks they always not consistent performance and losing chance before several match ended.