Thanks for taking the time to write up these lists. I agree in terms of species Monarto and Werribee are very comparable. I think what gives Monarto the edge is the sheer size of their exhibits and the numbers in the groups.
Monarto hold the largest lion pride in Australia; Werribee have a trio;
Werribee hold five bachelor bull giraffe; Monarto have a herd of around 20 giraffe and regularly breed.
Werribee have a bachelor troop of three male gorillas; Monarto have the second largest chimpanzee troop in the region with several infants.
Through no fault of their own, Werribee’s Southern white rhinoceros herd haven’t bred in over a decade; Monarto have had several calves.
This is what I really love about Monarto: the vast open spaces and big herds. I love how arid it is too - it's one of those places that can't be judged by the species list. Without visiting it you don't really get a picture of how good it is. The red soil in itself plays a huge role there.