Do you guys mind telling me the different between economics and bus man, are they similar are entire different?
Perhaps have a look at the study design to make your choice a little easier. The one that has more appealing content in your opinion is probably the one you should take, regardless of marks or workload.
Edit: AngelWings has already said this... so reiterating.
Link for current Economics study design is
here and link for current Business Management study design is
here. Keep forgetting that you're pretty young, so you probably have no idea where VCAA keeps their study designs.
For future reference, you can check out all VCE study designs
here.
Reason I prefer that you check the study design yourself is because people have their own interests, strengths and weaknesses (and the best way to pick a subject - apart from it being a prerequisite - is usually what you enjoy the most, as this will keep you motivated). The best judge for which will be best/ more interesting for you will be yourself.