Well she said Chemistry AND Physics, if you look at her earlier posts she also asked weather if Chemistry, Biology and maths is an overload. So I'm assuming she's assuming we know what she posted earlier. LolI think OP is asking which one of the 2 is better^.
Workload: subjective, but Chemistry has a LOT more content which requires a LOT more memorisation - Physics has less rote learnt content and is more applied understanding so the actual content is less.
Mathematics: Physics more, but neither has a particularly high amount.
Scaling: Chem very very slightly higher.