I think it depends on the about being offered here. if the scholarship is like 10k a year, you should probably go UTS lol.
but unsw facilities and lecturers are pretty good from my experience. I don't know if this applies to engineering but with law, the learning experience at UNSW is just so much better than at UTS. My gf does law at UTS and its just terrible. Lecturers don't give a fuck about feedback after assignments (tell you to read the course outline or 'send them an email' instead) etc,
I've found that at unsw the teachers ALWAYS make time to see you face to face, and provide you with feedback.
And i've posted on another thread how this tutor hitting on students, and if the students doesnt straight out reject him, he gives them HDs for participation.....
But this is just law, so engineering might be MUCH different. so you should ask around i.e. existing students on what its like.