If I compare between Bayern Munich and Dortmund, I think I'm more interested in Dortmund. Because after all, Bayern Munich only has a record as a club that really dominates the Bundesliga by winning consecutive titles. But in fact, Bayern Munich also quite often get great players from Dortmund. Also about Dortmund, even though Dortmund often sell key players and star players, but Dortmund has always managed to build a team well. The proof is, Dortmund has always managed to challenge Bayern Munich in the title race and because of that, I think Dortmund is a very unique team. Because no team can produce great players every season like Dortmund and also be willing to sell them, it's like a tradition that only Dortmund seems to have.
Not only from Dortmund but now Bayern is also always looking to other clubs like Leipzig.
There are some good players and of course a coach like Nagelsmann who did end up going to Bayern because he had more qualifications at Leipzig. On the player side, of course, Lewandowski has always been their best and most successful purchase even though there were indeed several other players such as Gotze or Sabitzer and Upamecano from Leipzig.
They really continue to intend to make this like a farm
On the other hand, for clubs like Leipzig and Dortmund, they really seem to continue to be under the shadow of Bayern, so they do farming with players to be bought at big prices as well as other options to their advantage as they know to compete in the championship is obviously very difficult so to do this option while continuing to be in the top 4.