I chose USYD. The reputation for UNSW commerce mainly exists on BoS - employers don't really distinguish between these two (UTS is pretty much on par for most acct/finance jobs other than IB/MBB). MBA in Australia though, definitely UNSW. If UNSW undergrad comm was really the pinnacle, top kids from USYD wouldn't be getting BCG Scholarship.
For law at USYD, you have both lectures and tutorials. UNSW, as mentioned above, has smaller classes which obviously has many advantages. USYD tutorials have 10-15 students so you don't miss out on much. You also have great lecturers here - experts in their fields. While initially I assumed they would be less willing to help - the lectures and tutes so far have been very friendly and open (i.e. help during class, consultations as well as email - pretty much writing a whole page explaining overlaps how/when to apply certain principles).
At the end of the day, if you go to either of these law schools - you aren't disadvantaged in anyway. A friend of mine recently did a clerkship at a big 6 firm. Everyone in that cohort was from usyd and unsw.