Heya!
Firstly, I'll just mention that it's all down to personal taste, so I could be completely useless, but I'll try to give you my opinion!
I did two of the subjects you listed, Maths and Psychology (I also do Creative Writing and Graphics).
I hate maths. My issue with it isn't that I find it difficult - I'm actually okay with it, and I can do it. I just find it boring. I've come to the conclusion that things I enjoy usually have some sort of meaning behind them - to me, maths seems pretty pointless. There's nothing to it apart from formula and method (don't get me wrong, it's challenging, but there's just no context or anything behind it). And there's a ton of graphs (and don't even get me STARTED on logs, blergh).
EDIT: just reading over what people have said, what I will say is that doing maths means I get lower offers at uni, and it does look good.
Psychology, on the other hand, I'm in love with. Probably along the same lines of the "having meaning behind what I learn" thing. There isn't anything we've done that I haven't found insanely interesting, and I always wanna know more. I'm actually applying to do psychology at Uni at the moment. I didn't do it before A level but choosing to study it was one of the best choices I've ever made (not like that's difficult, I make awful choices).
Another thing I'll definitely mention is that although they always say "don't choose your subject based off your teachers", I think teachers are a pretty important thing to consider. If you have a way to find out who teaches each subject, I'd definitely do that. I nearly dropped Graphics since the work load was insane, but my teacher really helped me and pulled me through. Boring teachers are the worst (maybe that's why I hate maths so much, too).
Rambling over! Hehe.