This is my ranking based on my preference for building realistic British zoos:
- South America Pack - All essential animals, including two that were high up on my wishlist (llama and capuchin). I've used animals from this pack more frequently than those in other packs. The scenery items are a little too themed and cartoony.
- Aquatic Pack - All essential animals that were on my wishlist, plus a great scenery pack, as well as the ever-useful faux rocks. This pack gave us a lot of "firsts" (marine mammal, penguin, deep diving and semi-aquatic exhibits). The caiman is one of my most used animals.
- North America Animal Pack - All much-needed animals, with the exception of the bullfrog. The frog isn't a bad choice but I would've preferred something different. The alligator and puma were high on my wishlist.
- Africa Pack - The rhino, meerkat and penguin were high on my wishlist but I would've swapped the beetle and fox for something else, although they're not terrible choices. The building set is useful, especially the plaster pieces and tiles. There's also some good foliage (drinn grass).
- Wetlands Animal Pack - All great choices with many "must have" species. The only exceptions are the water buffalo and platypus purely because they don't fit into the zoos I build. The otter and capybara were high up on my wishlist.
- Conservation Pack - Three animals that were on my wishlist (leopard, siamang and axolotl) but two that I'm indifferent to (horse and oryx). The building set is useful (especially the beams) and there's some great foliage (buffalo grass).
- Twilight Pack - I love the skunk, raccoon, fox and bat but have little use for the wombat. Two animals from my wishlist made it into the game due to this pack (the bat and fox). Some of the foliage is great (namely foxgloves, ivy and dead leaves) but most of the scenery is too themed for my liking.
- Europe Pack - I liked every choice in this pack (with the exception of the ibex) but only the lynx was high on my wishlist. The scenery items have been useful.
- Arctic Pack - The polar bear and reindeer are essential animals that I use frequently. The wolf is an acceptable choice (though not the best) but the sheep is useless to me. The wooden/slate building set is a must have.
- Grasslands Animal Pack - The emu and wallaby were at the very top of my wishlist and the caracal and maned wolf are nice to have. The other animals were either very mediocre choices (blue wildebeest, striped hyena) or outright disappointing (six-banded armadillo instead of a more common zoo species). This would've been my least favourite pack if not for the emu and wallaby.
- Southeast Asia Animal Pack - The binturong and clouded leopard are the only animals I frequently use but the babirusa, sun bear, stick insect and Malayan tapir are nice to have (even if some of them are broken). I don't see much use for the dhole and I would've much preferred a more useful monkey than a proboscis.
- Arid Animal Pack - The porcupine is the only animal I'm excited about. The rest don't fill me with much excitement personally.
- Australia Pack - For me, this pack had no real "essentials", besides maybe the kangaroo. I've enjoyed having the cassowary but the dingo and koala probably won't see much use from me. The heavily rusted scenery pieces rarely fit into my (mostly) European zoos.
- Tropical Pack - None of the animals are particular "must haves" for me but it's nice to have a fossa and a lar gibbon. I'm still upset we got a three-toed sloth instead of a two-toed sloth. I use the wooden building set a lot and the foliage is exceptional.