for all those ppl bickering about com/sci and that the commerce is diluted, let me set you straight..... Porbably the part that is diluted the most is the electives that you can take from other faculties...which are (lets face it) just credit point fillers anyway. Both degrees do actually take 3 years each, if you think about it, because you split your 3-4 commerce junior core subjects (accounting, economics, buisness information systems and Econometrics) over 3 years...so you actually do more work than most ppl (5 subjects per semester in year 1).
You do a science degree as normal, and complete it over the 3 years, and you do the final 2 years of your commerce degree in years 4 and 5. So you really don't lose too much
Yes, I think it does depend on what majors you choose.... I'm doing psychology for science and either management or marketing for commerce. I decided to do a double degree firstly because I don't really know exactly what I want to do as a job...therefore I am broadening my career options. Plus, I have a strong interest in both subjects, so it is rewarding for me anyway