Hey!
So first things first. both tutors are pretty good and doing any of them can be beneficial if used correctly. I've also been to both so I'll give me opinions. Firstly, VIE course. So I remember you had to sit an exam (like the selective one) to get into the tutoring. This was used to find which level of tutoring you should enter. I think there was A class (being highest), B class and C class (being lowest). I got into the A class but if I'm going to be entirely honest, there's barely any actual difference with being in A, B or C class (maybe only like the people in your class might be more 'like minded'). But anyways, they will give these practice tests and you will complete them for homework and then at the actual class they will go through it. The practice tests were... fine. I say this because we only got a practice exam every week and they were decent. The math was pretty easy tbh but the english was decently good. Next is JAC. Jac is known for spamming heaps of practice tests which can be a good and bad thing. I think the practice tests from JAC were pretty good. They are also known for having extremely hard math and nr tests which I would personally say SOME were harder than the actual test. I attended the online classes and if im going to be entirely honest... I didn't attend any online lectures (maybe like 3). Personally, I just found them useless (as there was a video which directly gave solutions in a direct and quicker way) but also because there would be about 200-300 students in each lecture.
In all honesty, if i could go back in time, I would do JAC and grind their practice tests whilst just self studying for the test. I personally think that the teaching from tutors can be a bit useless as there are so many other ways of getting taught (e.g youtube, khan academy, friends and even people from the selective discord who are willing to help)
Anways GOOD LUCK and I hope this helped just a tiny bit