If it comes down to MBA programes in germany there are in my opinion only two valid choices. That is Mannheim or WHU.
The value of the MBA comes from the brand of the business school, since the degree as such has no academic relevance and is not governed by many restrictions like a PhD. Therefore the Brand and the ranking within the world or europe is very very important.
The second most important thing is the community or albumin network that you join. You want a diverse school with people from germany but also from other country's if possible. In addition higher valued schools draw on students that are high achievers. This also is very important because you learn much from your colleges within the program as well and hopefully build lasting relationships.
I did not mention the skills thought in the MBA - the answer why is simple : skills can be learned by everyone but the experience you make within the courses and the relationships/network that you bring to the table is unique to you.
I would recommend Mannheim or WHU or go even further and join ESADE, Bocconi, HEC, LBS or HSG (Sankt Gallen if you prefer more german speaking regions), IMD is also a very valid choice.
In addition dont go for a "specialized MBA" this is the greatest ruse in the last years of MBA programmes, the value lies within being a generalist not a specialist if you choose this path.
see also Havard Business Review - Why generalists get better job offers
https://hbr.org/2016/06/generalists-get-better-job-offers-than-specialists?utm_campaign=HBR&utm_source=linkedin&utm_medium=social