Which will produce the better income, being at the top in sponsord search or being at the top of the organic search
I check out the top few organic SERPs and tend to avoid the sponsored links. I'm more likely to click an advert which is generated by the content I am reading and is relevant to that content. So organic search rather than ppc...
I doubt if there is a definitive answer. The best thing to do is to test it and see what works best for you. Running a PPC campaign will tell you quite a bit about your page and it will tell you in a short period of time.