SEMrush is so feature rich it's like your most favorite desert and after dinner drink all in one - with second helpings included! The keyword data, the social posting tool, the competitor data and more is simply incredible. The training tools, special webinars, and all the support SEMrush offers clients is of tremendous value over and above all its functionality as an SEO/SEM tool.
Of the three popular backlink reporting tools (Majestic, Moz, Ahrefs), Ahrefs provides the most useful link data. Even in other areas of SEO, Ahrefs seems to always keep their toolsets fresh. They continually add in useful tools and features that make other software suites less relevant. The most recent addition is their site audit tool which provides a beautiful visualization of technical site issues.
The other star feature of the Domain Vs. Domain tool is it provides you with a detailed report on the competitors’ domains. You can see all the common keywords their domains are associated with and compare their website’s position for each keyword to your own. This allows you to get some insight into what is working for the competition and mimic their success by optimizing your ad strategy and content marketing.