In terms of rankings, I'd say that UNSW is probably the better pick. However, you also need to factor in travel time, and how convenient each campus is to get to. UTS is right in the middle of the city, whilst UNSW is in Kensington. Also, do you have any scholarships from either? This may influence your decision.
Ultimately, to get a graduate job where you get your degree isn't as important as what you did. Being involved in societies, having projects and getting pretty good grades is more important to an employer than just getting into a 'good' uni.