The only great strength of the Swiss zoo in this category is the elephant park.
That is if you only consider mammals, but for geographical categories all classes are relevant. Therefore, the wonderful paludarium in the Exotarium counts (all except the mudskippers are Asian) as do the two Indo-pacific coral reefs, the larger of which I would argue is, while not as big, and perhaps not as technically advanced, more attractive and exciting than even the one at Burgers'.
@antonmuster
That said, in terms of birds and reptiles, Zürich admittedly has very little. The very large and nicely done aviaries near the red pandas (which I forgot to mention in my previous post are actually onshow still despite Panterra construction, and their enclosure is excellent) with Eurasian Spoonbills and Ural Owls, as well as the free-ranging Red Junglefowl in Kaeng Krachan, with Crested Partridge in a separate enclosure within said house. So far as I can tell, only the Reticulated Python are Asian amongst the current Exotarium inhabitants, but there are also Black-breasted Leaf Turtles in Kaeng Krachan and Savu Python in the Ape House.
Which leads me onto a question for anyone who has visited Paris more recently than myself - what do they have on offer in terms of non-mammals? How many of the inhabitants of the Grand Voliere and the two reptile houses are Asian, for instance, or do any of the European Vivarium species at Vincennes have ranges that extend into Asia? I was really fond of all these exhibits, and they could potentially be quite significant.
Another factor in Zürich's favour is the theming, which in Kaeng Krachan is really well-done, as it impacts the visitor areas more so than the animal ones, never compromising welfare for a more impactful sightline. And yet, it does do well to add to the immersion, to educate visitors about other cultures and, in the case of Kaeng Krachan, to discuss Zürich's
in situ conservation work. For me, this is the gold standard for how such theming should be done, and I perceive this as a role model for zoos that want to try their hand at it.
All that said, I will admit that the orangutan enclosure is atrocious, and if other voters are of the belief that it is singlehandedly enough to cost Zürich a 4-1, then I will not argue with it. That said, I do not think that it is sufficient reasoning myself, as the overall standard of enclosures at Paris is far lower, and that includes a very subpar orangutan enclosure of their own.