I'd pick economics. At my sixth form it is very popular and there are two classes that have over 20 students in it whereas there is only one A level business class which has 16 students. At the start of sixth form, I was doing business but then later switched to economics because it seemed more interesting and links in well with geography. It is very interesting! When I was doing business it was very boring, it was just stuff on decision making, management etc so it could be considered a deep subject whereas economics is much more broad. However, I've heard business gets more interesting at A2.