Hi,
Both the courses have its own advantages as political science deals with politics . It also includes public administraton and law . While economics is a commerce related subject and is known as extension of finance .
If you have to choose between these two then economics will be a better option as it deals with 3 major streams commerce , finance and banking sector and it has a wider scope .  Also after graduation you can apply for post graduation and gain knowledge about the course.
Hope it helps .