Hi...its been a few days since you posted but I just thought I'd throw in my opinion.
I'm doing biology 3/4 this year, and health 3/4 next year. I'm not sure about next year but tbh this year, I definitely prefer biology over health. The content in biology that you will cover next year is as follows (you can also look at the study design)
Unit 3 AOS 1Basically cells, how they function, and how they stay alive. Some of this is really just a continuation of Unit 1 - you will learn about plasma membranes and their components, DNA, genes and gene regulation, enzymes, and (what I dread most) cellular respiration and photosynthesis). It goes quite a lot deeper into how it all works compared to unit 1, however I found it a lot more interesting, however, this AOS, in my opinion, is the most draining.
Unit 3 AOS 2This is all about immunity, and signalling molecules in the body. You will look at different pathogens (e.g. virus's, bacteria, etc.), and what they do in the body, and how the body responds to these. You also look at types of immunity (e.g. exposure to pathogens, vaccination, antibody injections, etc.), and malfunctions of the immune system like autoimmune diseases (e.g. multiple sclerosis), immune defficiency diseases (e.g. HIV) and allergic reactions.
I found this topic quite challenging at times, however absolutely fascinating to learn about.
Unit 4 AOS 1This one is about evolution and biological changes in a population (basically how things change over time). There is a genetic component (relating a little to Unit 2), but then it goes a lot deeper into environmental factors that contribute to these changes (via natural selection), and you'll look at fossils and how they can be used to determine how long ago a species lived. The course also covers relatedness between species - so what defines a species, and looking at dfferent ways that species evolve. And finally (another favourite of mine) human evolution and how humans have changed over time.
While some of these topics were a little less interesting, a lot of the rest of it was completely amazing to learn and something that I really enjoyed.
Unit 4 AOS 2This AOS is basically about how we can read and understand DNA and different technologies that help us to do this, as ewll as applying this to society more broadly, such as drug development, dealing with diseases, and the ethical, social and biological implications of this.
I found some bits of this really interesting, particularly the later parts of this unit.
Deciding between the two subjects needs to focus on your interests, and how this could benefit you in the future (in regards to the skills you build up, not just with study skills that may differ between the two subjects, but also (at least at my school) different classroom settings). I personally find biology to be a much more interesting and enjoyable subject (I found Units 1/2 a little boring at times, as well), but your choice must be around you, not the scaling or any of that.
Good luck
