like for general in the 80s, 90s and for 2U maths 60s,70s
it's very difficult to predict what marks you'll actually get , especially when you don't even know what exactly the subjects are about
which is why the whole 'which subjects should I do' thing [and to some degree, ATAR predictions] doesn't make sense to me
don't let things such as scaling affect your judgement
follow your heart and do the things you like and/or are good at
personally I'd recommend 2u maths over general maths, esp. if you're gonna need some maths in your further studies
if not, it's up to your personal preferrence