When choosing SEO software for organic traffic estimates remember that these are estimates for a reason the exact data is only available to the website owner via Google Analytics. Outside of organic traffic, some of the estimated traffic data points you can see using these tools are:
- Direct Visits: Number of direct url visits
- Referral Visits: Number of visits outside of the search engine
- Social Visits: Visits from social media
Consider additional features outside of the estimates before making your final choice, a complete SEO toolbelt is important for ranking well.