Oraganic Taffic refers to the listings in the main area of Google's search results. These listings show up in the center of your screen and are displayed based on Google's natural algorithm. These listings cannot be paid for but can be targeted through content and external factors.
AdWords is Google's advertising program. AdWords listings show up at the top and on the side of Google search results and will typically appear in yellow at the top and in small boxes on the right-hand side. These are listings that can be paid for directly through Google's advertising program.
I think SEO is the better one compared to Google adwords. Based on SEO your business get more traffic, Keyword Ranking and SEO is paid less.