Currently Leipzig is getting a lot more love than either of the Berlin zoos, though it isn't hard to see why any of them are top standard. Likewise for Cologne, Wuppertal, Wilhelma, Magdeburg and Frankfurt.I think most would agree that zurich is clearly better than Basel and Pairi Daiza better tthsn Planckendael. Burgers and Blijdorp are rated rather equally and Cologne is really one of the German top zoos and Tierpark Berlin less so.
Tell me @lintworm could you help me out with the Hungarian, Danish, French and Spanish entries?