I can tell you from personal experience that Talent is a cut above the rest. I attended Talent for 4 years and started back when i was in year 9. Honestly, all the resources and help are available for you there, and if you're willing to do the work you will succeed.
Based off feedback from my friends i have heard that the tutors at Matrix are not the best, I've heard stories of tutors who aren't exactly totally capable or confident with teaching material, and other tutors who are unnecessarily strict or short tempered.
I think that's a huge deal because after a long day of school, or when you're sacrificing your weekend, you don't want to be in a negative environment, and i honestly never had that issue at Talent. All the tutors are welcoming and super fun, even when i had a sub they made the classes very enjoyable. Even in terms of teaching content, they were extremely capable. The tutors were really confident and taught it in ways which i could understand rather than just in one specific way in which most students are expected to "learn." They call the tutors "mentors" and i think it's so appropriate because they really are more than a tutor, they become a friend.
I have nothing but good things to say about Talent, they helped me achieve a band 6 in all the subjects that i received tutoring in, and I've made so many friends there and honestly improved my knowledge a substantial amount. I haven't heard much about Dr Du or Dux, but I've never really heard anyone boast how amazing it is. I don't think you can go wrong with choosing Talent.
I hope this helped ^^