If you would enjoy working at your own pace, and having more freedom, tafe is the place for u. Lots of different people, no cliques, treated like an adult etc.
The tafe I go to, there is no year 11 per se. you can do both year 11 and 12 in one year, with all your exams at the same time. Or, you can stretch it over two years, 3 subjects each year = 3 hsc exams per year.
You'll have a lot more free time, some days I don't have classes at all. You can pretty much pick a course that works for u. As for quality, that's up to you. The teachers only help u if u want help. You're not pressured by anyone. But if u want to do well, the teachers are just as good, if not better in my experience.
Let me know if u have any specific qs