PPC Services vs SEO serivces

I would to know what is the best workable and profitable service.
1.what is more profitable service ?
2.what fee is charged for ppc services ?
3. what fee is charged for seo service ?
4.what buisness prefer to pay for , ppc or seo ?
(I know that this general question but the ideas is to know how do I setup my price)

See original post by solikatir