I think this thread idea may have been done already but I couldn't find it... So here goes. Also I'm only going to include habitat animals because it is a bit unfair otherwise to compare.
Arctic Pack:
Favourite - Reindeer: PZ launched with 0 deer species in the game which was obviously a huge omission so getting a deer here was a pretty big deal especially one as iconic as reindeer.
Least Favourite - Arctic Wolf: I probably don't need to elaborate on this, its a basic reskin and probably one of the most disappointing additions in the game.
South America Pack:
Favourite - Giant Anteater: Just a complete oddball animal that is iconic and completely different from anything we had previously.
Least Favourite - Jaguar: Of course it's a good animal but considering we already had quite a few cats in the base game this makes it a bit less exciting... Yes I even prefer the llama since I use it way more.
Australia Pack:
Favourite - Koala: Completely unique and extremely cute and iconic, I still have to build very unique habitats for these compared to the other animals in the game.
Least Favourite - Dingo: It's just nowhere near as interesting as the other three, not as bad as the Arctic Wolf though.
Aquatic Pack:
Favourite - Giant Otter: Hard to choose for this pack as it was really incredible with its animal choices but I'm giving it the Giant Otter because I think its a lot easier to make habitats for and my home zoo (Chester) has an excellent habitat for them that I can take a lot of inspiration from.
Least Favourite - Cuvier's Dwarf Caiman: Awesome to get a small crocodilian but its hard to compete with our first otter, seal, and penguin.
Southeast Asia Animal Pack:
Favourite - Binturong: Cute, unique and arboreal = good. Still our only viverrid and I love building for these guys.
Least Favourite - Proboscis Monkey: Considering how limited our monkey pool is I really am not a fan of getting a species almost non existant in captivity when there was way better options from this region.
Africa Pack:
Favourite - Meerkat: Considering these are in almost every zoo at this point these were an absolutely essential addition that also helped pave the way for smaller habitat animals.
Least Favourite - Fennec Fox: This is another pack where all the animals were great but personally this was just my least favourite of the bunch, I use the others way more.
North America Animal Pack:
Favourite - Black-Tailed Prairie Dog: Similar reasoning to Meerkat, but I think I prefer these even more personally. Just super fun to add habitats for anywhere and especially great with Bison. Just a super fun animal.
Least Favourite - Arctic Fox: Just a bit of a weird choice for the pack, there was a lot of more interesting options out there I think.
Europe Pack:
Favourite - Eurasian Lynx: Really fun to make habitats for with lots of giant trees and was great to "complete" the European predator trifecta for my native European areas. Badger is pretty close though.
Least Favourite - European Fallow Deer: This is another pack with a great animal selection but someone has to be the loser, I love that its in the game but I don't find them as fun to build for as the others.
Wetlands Animal Pack:
Favourite - Red-Crowned Crane: A really unique bird... Something we don't get often, an absolutely amazing addition and great to make habitats for all around.
Least Favourite - Wild Water Buffalo: Why couldn't it have been the domestic form?
Conservation Pack:
Favourite - Siamang: Our first gibbon! And it introduced brachiation to the game allowing us to build new habitats. Such an awesome addition.
Least Favourite - Scimitar-Horned Oryx: It's a common zoo antelope and our first EW animal but its just not as interesting to me compared to the rest of the pack.
Twilight Pack:
Favourite - Raccoon: Fun to build for, unique looking, and just very cute and lovable. I love trash pandas.
Least Favourite - Red Fox: I've listed all the foxes so far as least favourite in their pack, I like foxes but they tend to always be the weakest of the bunch it seems.
Grasslands Animal Pack:
Favourite - Emu: This was such a long overdue animal, Australian areas finally felt somewhat complete with this addition. That's how important it was.
Least Favourite - Blue Wildebeest: It's another African antelope, it can't compete with the rest of the pack.
Tropical Pack:
Favourite - Lar Gibbon: Many were happy with ust the Siamang but I still really wanted the Lar Gibbon so I was super happy to see it added. Great to have two gibbon species.
Least Favourite - Asian Water Monitor: It's cool to have an Asian equivalent for the Nile Monitor I guess? Just not that interesting to me compared to the rest.
Arid Animal Pack:
Favourite - Dromedary Camel: It's very close with the porcupine but finally getting the Dromedary felt great and something that really should have been there since the beginning, it just felt right.
Least Favourite - Sand Cat: I've just never gotten the hype around it, I'm cool with it being here but for me I'm just going to keep using the Fennec Fox most times.
Arctic Pack:
Favourite - Reindeer: PZ launched with 0 deer species in the game which was obviously a huge omission so getting a deer here was a pretty big deal especially one as iconic as reindeer.
Least Favourite - Arctic Wolf: I probably don't need to elaborate on this, its a basic reskin and probably one of the most disappointing additions in the game.
South America Pack:
Favourite - Giant Anteater: Just a complete oddball animal that is iconic and completely different from anything we had previously.
Least Favourite - Jaguar: Of course it's a good animal but considering we already had quite a few cats in the base game this makes it a bit less exciting... Yes I even prefer the llama since I use it way more.
Australia Pack:
Favourite - Koala: Completely unique and extremely cute and iconic, I still have to build very unique habitats for these compared to the other animals in the game.
Least Favourite - Dingo: It's just nowhere near as interesting as the other three, not as bad as the Arctic Wolf though.
Aquatic Pack:
Favourite - Giant Otter: Hard to choose for this pack as it was really incredible with its animal choices but I'm giving it the Giant Otter because I think its a lot easier to make habitats for and my home zoo (Chester) has an excellent habitat for them that I can take a lot of inspiration from.
Least Favourite - Cuvier's Dwarf Caiman: Awesome to get a small crocodilian but its hard to compete with our first otter, seal, and penguin.
Southeast Asia Animal Pack:
Favourite - Binturong: Cute, unique and arboreal = good. Still our only viverrid and I love building for these guys.
Least Favourite - Proboscis Monkey: Considering how limited our monkey pool is I really am not a fan of getting a species almost non existant in captivity when there was way better options from this region.
Africa Pack:
Favourite - Meerkat: Considering these are in almost every zoo at this point these were an absolutely essential addition that also helped pave the way for smaller habitat animals.
Least Favourite - Fennec Fox: This is another pack where all the animals were great but personally this was just my least favourite of the bunch, I use the others way more.
North America Animal Pack:
Favourite - Black-Tailed Prairie Dog: Similar reasoning to Meerkat, but I think I prefer these even more personally. Just super fun to add habitats for anywhere and especially great with Bison. Just a super fun animal.
Least Favourite - Arctic Fox: Just a bit of a weird choice for the pack, there was a lot of more interesting options out there I think.
Europe Pack:
Favourite - Eurasian Lynx: Really fun to make habitats for with lots of giant trees and was great to "complete" the European predator trifecta for my native European areas. Badger is pretty close though.
Least Favourite - European Fallow Deer: This is another pack with a great animal selection but someone has to be the loser, I love that its in the game but I don't find them as fun to build for as the others.
Wetlands Animal Pack:
Favourite - Red-Crowned Crane: A really unique bird... Something we don't get often, an absolutely amazing addition and great to make habitats for all around.
Least Favourite - Wild Water Buffalo: Why couldn't it have been the domestic form?
Conservation Pack:
Favourite - Siamang: Our first gibbon! And it introduced brachiation to the game allowing us to build new habitats. Such an awesome addition.
Least Favourite - Scimitar-Horned Oryx: It's a common zoo antelope and our first EW animal but its just not as interesting to me compared to the rest of the pack.
Twilight Pack:
Favourite - Raccoon: Fun to build for, unique looking, and just very cute and lovable. I love trash pandas.
Least Favourite - Red Fox: I've listed all the foxes so far as least favourite in their pack, I like foxes but they tend to always be the weakest of the bunch it seems.
Grasslands Animal Pack:
Favourite - Emu: This was such a long overdue animal, Australian areas finally felt somewhat complete with this addition. That's how important it was.
Least Favourite - Blue Wildebeest: It's another African antelope, it can't compete with the rest of the pack.
Tropical Pack:
Favourite - Lar Gibbon: Many were happy with ust the Siamang but I still really wanted the Lar Gibbon so I was super happy to see it added. Great to have two gibbon species.
Least Favourite - Asian Water Monitor: It's cool to have an Asian equivalent for the Nile Monitor I guess? Just not that interesting to me compared to the rest.
Arid Animal Pack:
Favourite - Dromedary Camel: It's very close with the porcupine but finally getting the Dromedary felt great and something that really should have been there since the beginning, it just felt right.
Least Favourite - Sand Cat: I've just never gotten the hype around it, I'm cool with it being here but for me I'm just going to keep using the Fennec Fox most times.