Zoos, conservations, wildlife parks are all hugely different things.
I find Zoos to be typically for-profit, like an amusement park. Animals are taken care of, enrichment -NOT- always a primary concern (only given toys and breeding programs when people are watching, because cute sells). I consider SeaWorld and most City Zoos to be of this type.
Conservations are all about the animals. Some hardly ever allow people in without paying a lot or donating. The California Condor Conservation is a good example of this one.
Willdlife Parks usually feature animals in an environment as close as possible to their natural habitat and promote social structures like herding, free breeding and full access to food and enrichment. Ive seen multiple wildlife parks for North North American species like caribou, and it really is breathtaking as opposed to zoos.
If people want to moan about zoos, I encourage to do so as although many are very good and fall more in line with conservation (National Zoo) some are only there for the cash (SeaWorld).