Bio and chem all the way for me. I hate the physics (but I don't tell the kids that).
Worth a comment, I think. I posted earlier that I'm a retired physics teacher, and by that I do mean just physics. Yes, I did dabble in GCSE and A level electronics once upon a time, but that was after school. I've also taught part of the IB theory of knowledge programme, when I was at an international school. And OK, I took a turn, like the rest of the department, at teaching Year 7 science (two years out of nine, at my last school). But mostly, just physics.
But this was in independent schools, where the sciences are taught as separate subjects, with specialist teachers, from Year 8.
Reading this thread though, very few physics teachers seem to exist. And I think I know why.
As I recall (although my memory may be clouded by cynicism) a previous government - not sure what flavour - found they had a shortage of physics teachers. And they hit upon a cunning plan. Force people who were at all interested in teaching any science to teach all of them. Of course, the law of unintended consequences kicked in, as anyone who had actually thought about it would have foreseen. Biology specialists hate teaching physics, and physics specialists can earn far more money in the finance industry and would rather do that than teach biology. So now there's a shortage of physics teachers - and probably science teachers in general.
I'm completely out of touch with the situation in state schools, but I get the impression there are no jobs for physics teachers anyway, only science teachers. So people who want to teach just physics need not apply. So sad.