Hamburg is former British Occupation Zone, so that means they had freedom of press early on, but little to eat and lack of goods.
Frankfurt is former American Occupation Zone, so no freedom of press until later, but lots of C.A.R.E. packages and early market freedom.
Which explains why we not only have more Gibson basses today but also why the US stadium rockers like Journey or BÖC would regularly tour Frankfurt, but not Hamburg - no GIs stationed there as guaranteed audience.