There are a number of really good studies (some newer than others) that are worth checking out when you get a chance:
- BuiltVisible analysis of Moz, Majestic, GWT, Ahrefs and Search Metrics
- SEOBook comparison of Moz, Majestic, Ahrefs, and Ayima
- MatthewWoodward study of Ahrefs, Majestic, Moz, Raven and SEO Spyglass
- Marketing Signals analysis of Moz, Majestic, Ahrefs, and GWT
- RankAbove comparison of Moz, Majestic, Ahrefs and Link Research Tools
- StoneTemple study of Moz and Majestic
https://moz.com/blog/big-data-big-problems-link-indexes-compared
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