@aardvark250: Some of your examples are incorrect. In the way of "keeping" the animals you listed, there is no difference (or even sometimes a "pro" for Western zoos). Cetaceans live in at least the same (but in generall probably better) conditions as in Asian zoos/marine parks. Highest age record for their species is - afaik - for orcas and belugas kept by western institutions. Also, I have never heard that an asian zoo has had more breeding records for orcas as the SeaWorld Parks (and I have in mind that record breeder of belugas is a Canadian Marine Park, but may be wrong in this case).
For pangolins you are right. The main reason is that some Asian zoos can feed them with their natural diet, because the animals come from the same country where the zoo is located (e.g. Taipeh Zoo). Also they were (until recently in Chicago?) never imported in big numbers to establish a breeding population in Europe and North America.
Ref. Asian Black Bears: They have done (and still do) very well in Western zoos. They breed well and became very old. But because they are not so endangered, they have been (and will) replaced by other and more threatened bear species.
Ref. Sun Bears: Breeding records in Western zoos are in indeed in generall insufficient.
Black faced spoonbill: Never imported in big numbers, also very similar to species that could be easier acquired like African or Eurasian spoonbill.
@Pertinax: Sumatran rhinos do not better in Asian then in Western zoos,