As a f.6 student, i hope my advice can help u. What I suppose ur choice right now is quite important because it will affect ur future in both academy and career.
I guess u shouldn't consider the syllabus of the subjects but focus on your interest. Choosing Art stream should likely be a student who likes to express their emotion and love reading or writing. Choosing Science stream would likely need to be always thinking in a logical way.
In fact, i can say the science subjects have quite a lot to memorize too unless u understand all the conepts. Besides, u need to memorize the keywords for the CE, if not u can't gain the mark.
As for Economics, for me, i think it is quite an easy handle subject. u must be quite interesting in daily news because the economics theory would need to apply on different cases. It is not really difficult.