Your German-language skills will determine outcomes more than the choice of school. The FT data show these schools don't have great international mobility, but WHU and HHL do much better. WHU's location is not an obstacle, since the Rhine/Main valley has great public transport connecting up a series of prosperous cities.

I would pick WHU, since the FT it ranks best for international mobility and aims achieved.

In Frankfurt, many students will struggle to improve their German. Perhaps that is why it has the lowest mobility of the three FT ranked schools.

PS I don't see any reason to consider EBS, unless your specific goal is marriage.

I would like to clarify that after my degree I want to work only in Germany and not out of it.

And I seriously didn't get that EBS for marriage thing?

I think the marriage thing was meant as a joke.

How are your German language skills? If you are already fluent - or close to fluent - WHU / Frankfurt / HHL could be good routes to working in the country. With little to no German language skills, you will struggle, no matter what school you attend.

The marriage comment means that EBS is one of those plummy, posh schools for students who want to be around the right sort of people but not have to work too hard. Similarly: Hult, Nyenrode, LSE, Pepperdine are excellent places to find a spouse.

So basically I get that WHU Otto is the best choice among these. Now what if we also put ESCP into the equation? What would you pick, ESCP or WHU Otto?

WHU. ESCP is in Berlin, which has half the GDP per capita of the big west German cities.