Berlin. Hands down. While both are big cities in Germany, that is where the comparisons should stop. Frankfurt is a metropolis that was rebuilt with modern architecture after WWII. While yes, there are museums and some unique neighborhoods, it is really just a big city. Where Berlin on the other hand, has a great mix of modern buildings popping up while the beautiful Baraque architecture was still recaptured in the rebuilding. Each part of Berlin has it’s own unique feel and vibes, making it an interesting city to explore rather than being a concrete jungle. And you won’t just find Germans in Berlin. It’s a wonderful conglomerate of cultures from expats to Turks to the Jewish quarters and more.