I say economics is a lot more harder than business and alot more quantitative. It's also pretty useful in understanding all the business news you see on TV especially the EU and government policies.
Plus economics has a unit called business economics in the 2nd year. So if you have an interest in business you will learn some of the business stuff in economics. So you kill 2 birds with 1 stone.
However if you plan on doing an economics degree than do a level maths as well. Since an economics degree is very quantitative.