Ahrefs vs SEMrush

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Ahrefs
Ahrefs Site Explorer is a search engine optimization tool for monitoring and analyzing backlinks to a specific site. Huge index of links, data updates every 15 minutes, friendly interface and rich data analysis have made Site Explorer the world's most powerful tool for checking links. The tool can show links (including new and internal), linking domains, anchors, and best pages of a domain.
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SEMrush
SEMrush is created by SEO/SEM professionals for SEO/SEM professionals. We have the knowledge, expertise, and data to help you take your projects to the next level. We collect massive amounts of SERP data for more than 106 million keywords and about 100 millions domains, including: AdWords ad copies and positions, organic positions for domains and landing URLs, search volumes, CPC, competition, number of results, and so much more. We also provide accurate, customized data with quick turn-around times for your special projects.