a higher % of people (9% vs 6%) b6 chem but bio has a larger cohort with a bigger ‘tail’ (aka people whose parents forced them to do a science) so the stats are a bit skewed. It really doesn’t matter though, aside from your name being on hscninja or wtv, for your atar the leap from an 89 to a 90 is basically the same as 90-91 - and purely atar-wise, scaling balances everything out such that it really doesn’t matter what you choose, just stick with what you enjoy and are the best at (and if you’re good at both seriously just keep both for a bit, an extra 2 units won’t kill you). year 12 chem is really fun so worth considering it imo but I don’t do bio