I believe your question is a bit misleading...are you asking that SEO is a better bet than paid traffic or what?
Organic is simply better for delivering relevant traffic. The only channel that performs better in some capacities is paid search ads, but that is only for conversions, not overall traffic delivery (Paid Search only accounted for 10 percent of overall total traffic).
If you are doing SEO as well, you will get good organic traffic, it is the best way to increase traffic from search engines.
