What is best traffic for COD offer ?

hey any one can just suggest me that which is better for promote health product.Facebook or IG.i see some offer on adcombo network there product EPC is $ 1.90 and product commision is $17..so i think its a great offer for promote.so now any one can suggest me that which traffic source is better for that type product to promote Spain or other any country from Europe............
Facebook ?????
or other ??????

E-mail traffic will be good too. And banners from traffic brokers. Also native ads.