It really depends on what you want to do after school. But generally, if you can stay at school, please stay. Tafe is quite bad nowadays with the cuts and also has a limited amount of subjects compared to school. It also has a high amount of dropkicks and those who loathe school to the max-- those misfits that can't stand school at all. And I mean, they can't even bear going to a school even if a school accepts them.
Most students in TAFE are also extreme slackers. Some attend class for 10 mins and leave. The slackers in TAFE are even worse than the ones you see in school.
Most students in TAFE are generally not enthusiastic about their studies and if you want to do well in TAFE, it will be very hard unless you're first. If not, prepared to get dragged down completely by these slackers.
I generally do not recommend people to do their full HSC at TAFE, the only thing to go to TAFE for the HSC is that if your school doesn't offer the subject, or you have a timetable clash, or you want to do a VET course like retail, hospitality, accounting. So maybe 1-2 subjects at TAFE is alright instead of your full HSC.