You do a some legal studies in business studies. Having said that, I personally think with legal you become aware of your rights and when you get sued or whatever, you can defend yourself. With business, you inevitably learn about business. What I you don't end up perusing a business career?
I do legal and I know from first hand experience that the year 11 course is very dry. They leave all the good stuff for year 12 eg. Crime.
A lot of my friends do business and they always struggle with their exams and stress a lot about it. Where as legal no one really talks or stresses about an exam. Everyone does really well even if they make stuff up on the spot.
Having said that it's ultimately your decision.
Hope this helps a bit