Hmm - our school recently changed from jacardanda to heinemann. Basically, jac contains a lot of detail you don't need, although it has good explanations. So, you'll often find yourself looking for the content you need throughout a lot of useless paragraphs of detail you simply do not need. Heine is much more summarised, and it doesn't compromise in its explanations. From feedback from other bio kids at my school, apparently the questions in the jac textbook cover some content not in the study design.
I think you should go with the textbook your school chooses for you, as they will often refer to that textbook and it will be easier to follow through. But I recommend heinemann over jacaranda, simply because it is more summarised and rarely mentions large amounts of detail you don't need to know. Hope this helped!