Jungleworld vs. Tropic World is not even close. The diversity of Jungleworld (Asian tropics only) is at least that of Brookfield's (which includes African, South American and Asian sections), due to the gallery where numerous small reptile, amphibian and invertebrates are displayed. In terms of realism, it's even less close. Jungleworld was the first place that highly realistic rain forest buttress root trees were simulated, on a grand scale. The sight of gibbons brachiating through a living forest, punctuated by those huge trees, is breathtaking and not replicated in any other zoo exhibit.
Agreed, the leopard and tapir enclosures are less than ideal. The original inhabitants of the leopard enclosure were in fact Clouded leopards, who promptly climbed to the most hidden high spot in the exhibit and were basically unseen until replaced by the black leopards.
Also sadly missing today are the giant gharials that for years were the final "wow" in the last viewing area. The "python in the log" overhead in this area is a brilliant bit of exhibit design, crudely imitated but never matched by several other US zoos.
The original plan for the building called for the first exhibit to feature Komodo dragons. This never happened, and over time what was supposed to be a dry volcanic island habitat has been transformed into a more generic tropical space for tree kangaroos and binturong. Not all that successful.
As noted before, Tropic World was doomed to failure when the curators overseeing the design determined no living plants should be accessible to the primates in the exhibits--the usual veterinary paranoia that is thankfully less and less prevalent today. The awful artificial rocks and trees that by default become the exhibit's focal points are lessons in how not to build animal habitats.
Jungle World is still, IMO, the best indoor tropical forest exhibit in the world. Arnhem and Zurich are great, but intentionally do not exhibit much "megafauna", and do little or nothing to mitigate the perception of being in a giant greenhouse. Even with its flaws and areas that have declined, very few exhibits stand the test of time as well as Jungle World (Kifaru's comment about the World of Birds illustrates this).