Assuming this is all mammals that aren’t ungulates, primates or carnivores, so the term generally given as ‘small mammals’ despite some not being very small at all...
Both have capybara
Planckendael has Belanger’s treeshrew, black-rumped agouti, Cape porcupine, common wombat, dusky pademelon, Elbe European beaver, giant anteater, greater guinea pig, northern Luzon giant cloud rat, mara, Prevost’s squirrel, Queensland koala, red kangaroo, black rat, Southeast Australian short-beaked echidna, swamp wallaby and Tasmanian devil
Zurich has Barbary striped grass mouse, common rock hyrax, European harvest mouse, giant anteater, Linnaeus’ two-toed sloth, New South Wales koala, plains viscacha, Rodrigues flying fox, southern tamandua, St Vincent agouti, Swinhoe’s striped squirrel and Tasmanian red-necked wallaby
Zurich has less species but have more diversity order-wise.....I’m going with Planckendael for now based off of their cracking Australia section.