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didynamous Well, as you already know you get pretty accurate data of which URLs are ranking for which keywords. Then the keyword data include clickstream data which no other keyword research tool offers. This tells you how many people actually click on results and what the average clicks per search are, etc. Sometimes you have keywords with plenty of SV but very few clicks on results because of a featured snippet or something. That's something you'd want to know. Plus the SV data itself is more accurate than that of competitors. The keyword gaps tool is super useful to find out which keywords competitors rank for that you don't cover. This is important to get your topical relevance to a level to compete with them. The link intersect tool is great to find common links that competitors have, because these are the ones you'll want to get first. Well and at last their vast backlink data are going to help you find which domains competitors have links from, build lists for link outreach, find out which domains competitors link out to to try getting an indirect competitor link, etc. I rely heavily on Ahrefs, because it's just the best tool at what it does. That being said, you can do most of these things with SEMRush as well - just that it won't find as many backlinks, has no clickstream data and less accurate search volumes in general.