Organic SEO provides long-term benefits over pay-per-click (PPC) advertising. With SEO, results improve gradually and are sustainable, while PPC results are faster but drop off quickly. SEO is also more cost-effective, providing lifetime returns from an initial investment, unlike PPC which requires continuous spending. Additionally, SEO can improve organic click-through rates and match users to more keyword variations, while traffic quality and quantity tend to be higher for SEO.