Not much difference between the two.
However, to teach, you'll need at least a GCSE Grade C in English, Maths and a Science. A friend's son chose forensic science, and he did biochemistry at university. So think about including at least one, possibly two sciences in your options profile if you can. This will also give you the basis of a specialist subject if you decide on the teaching route, because primary teachers need a specialism. Science is good, because science teachers are in demand.
There is a point, though, in what Gef says, that 13 is much too young to be choosing a career. Unfortunately it's unavoidable these days, because the education system virtually forces you to choose. If you enjoy science, fine, do it. Whatever you end up doing in life, you will be happier doing it if you actually like it. But do give yourself other options, and take a range of subjects that you actually enjoy, be that languages, arts, humanities or whatever.
In the 1970s, my mum made me take Home Economics (which I hated) because "it'll stand you in good stead for the future". Because of the way the options were arranged, that meant I couldn't take Latin and/or German. Needless to say, at 47, I am the least domesticated person I know, but I pick up languages quite easily. Unfortunately, it's a bit late to do very much with it now.
Sigh ... if only I'd known then ...