For the first time I am considering the 5/0 option. Zagreb has some intresting small animals at the Tropical house, Madagascar house, well done Lion exhibit and few African Ungulates. The Monkey house is quite outdated, but Wrocław's Chimpanzee house is also not in the best shape.
Wrocław's African collection is enormous, presented in grand displays and not one zoo nerd associate the Polish zoo with Africa.
The Africarium doesn't need presentaiton, but there are also Dessert house, Madagascar house, many spacious paddocks wit African hoofstock, Giraffe/Zebra/Ostrich Savanna, Okapi, new Lion exhibit, African wild dogs. Significant Reptile collection with few spieces of African Crocodiles. Uncommon primates, like Putty-nosed Monkey, Lac Aotara Bamboo Lemur, Olive Babbon, L'Hoest Monkey. Very special bats - Hammerhead Bat and the unique for the Zoo World Malgashy Flying Fox. The African fish collection is also miles away of what Zagreb has to offer.
I will start with 4-1, but if I change to 5-0 , I will prepare better justification.