Kill 1 person, depending on whether you'd be imprisoned for it.
Something a little more specific
Would you rather get semi-decent ATAR by doing very hard subjects or get any ATAR you want, but have to sit the Prelim + HSC course for subjects you don't have now (if so what courses do you do)?
Not really sure what you are asking but I would definitely rather get a 99+ ATAR doing subjects I dont have now. They would include, Maths Extension 1, Mathematics, English Standard (as i do advanced), Chem, Physics, Legal and Modern History

The trouble is if i actually sit these subjects in reality, i would go (with the exception of Eng, Chem) completely horrible in!!
Would you rather give birth to a horse or breed with a cow? (<- completely random and not even biologically possible, but lol

)