I did politics and economics at AS level last year, I loved Politics and absolutely hated economics (which I assume is the same/similar with business studies). Politics I found easy because it was pretty much just memorising stuff and writing it in an essay, I got an A in it for my AS (idk if its the same any more, apparently they've changed the course a bit). Economics I found a lot harder because in our exams they gave us articles about businesses and we had to analyse them and apply theory to them and I found it really complicated and boring. I worked so hard for the economics AS exam last year and I got a C :/
Keep in mind that these are all my personal opinions, your brain may work in a completely different way to mine so you may prefer economics. Also, I had a really awful economics teacher who had no idea what she was doing and I ended up dropping the subject. I love politics however, and you don't necessarily need to debate and argue, just be able to understand political ideas and structures and explain them well. I think its a really useful subject.