Pat192847 Biology and Human Biology are fairly different subjects.
Biology topics include: ecosystem dynamics, biodiversity, species interactions, taxonomy, cell biology, bodies of different animals, DNA, genetics, biotechnology, evolution, infectious diseases, homeostasis.
Human Biology topics: human body systems (each system is a separate topic), human reproduction, cell biology (in much more detail than in biology), tissues, metablism, DNA, genetics, homeostasis (in humans, clearly, so very different than homeostasis in bio), infection (human body reaction to disease, rather than bio which looks at specific diseases and epidemiology), evolution (bio looks at all species and overall evolution from dinosaurs - human biology looks at the evolution of humans and their use of tools).
Definitely depends what your interested in. If you are good at managing high workloads, maybe do human bio. There is more content over the amount of time compared to biology (because biology looks at lots of examples, so it gives you a little more time to spend on each topic).
If you are wanting to pursue something like medicine, allied health, biomedicine, biochemistry, veterinary medicine, etc, I'd recommend human bio.
If you want to do something like zoology, conservation, botany, zookeeping, one health, epidemiology, marine bio, etc, biology might be better.
I am doing a bachelor of science double majoring in conservation & wildlife biology and animal health. I did both bio and human bio in ATAR. I find biology was relevant to my conservation & wildlife biology major, and human biology was relevant to my animal health major. So it definitely depends on what your interests are.