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I have read the blog that you've mentioned, the concluding line had said it all.The answer to the question is “It depends”, as both are legitimate sources of traffic. Both technics have there own Pros and Cons. It is up to you to decide which one will fit best for your needs, goal & budget. You can go through the blogs on SEO vs PPC available searching on Google.
One of my favourite blogs is Ahref's SEO vs PPC blog. In the blog, they have provided complete details regarding both technics with very good examples.