The backlink index is one of the best too though at the time of writing, Moz has just improved their index. Regardless of index size, which theirs is large enough, the type of data they provide is the most useful. The broken links data is probably the most useful that isn't easily matched by other tools. Additionally, going back to the content explorer, you can find unlinked mentions, a feature that appears to have been removed in Moz's "new" tool (I may just not be able to find it).
Ahrefs is incredibly comprehensive and straight forward. From keyword discovery to site audits I use ahrefs for all my SEO needs. It's the first SEO program I was introduced to when starting me SEM management career and has proven to be the best time and time again. I've used their competitors liker moz, SEM rush, and a couple other services- none of which have come close to stacking up. 

One thing I don't like is that Ahrefs sometimes does not provide exact keyword search volume. Instead – it provides approximate numbers which confuses us in cases when we think a keyword should get more traffic that it actually does once the SEO content is published. To get the most up to date and exact numbers, you'd better off use Google's keyword planner.
As a long time Moz user and I might even say a super fan of their product, it feels really odd to be writing a review of Ahrefs. But here we go--I love Ahrefs. The design, the UI, the gigantic keyword database and now the newly redesign site audit are a thing of beauty. I continue to be impressed by the data they provide, features that are added frequently and my favorite feature has to be the top pages report. (Not sure why I love that so much--but it just makes it extremely simple to research a site or competitor with that report.)
Ahrefs boasts the best link database among any system out there. It does most everything -- link monitoring, alerts, calculated metrics, the richest clickstream blend out there, and much more. Its UI is cluttered in a good way and the company has quick and polite support. And Tim Soulo -- the public face of Ahrefs -- has done a ton of good for the SEO community.

As a long time Moz user and I might even say a super fan of their product, it feels really odd to be writing a review of Ahrefs. But here we go--I love Ahrefs. The design, the UI, the gigantic keyword database and now the newly redesign site audit are a thing of beauty. I continue to be impressed by the data they provide, features that are added frequently and my favorite feature has to be the top pages report. (Not sure why I love that so much--but it just makes it extremely simple to research a site or competitor with that report.)
One of the things that AHrefs is best at is helping with a content marketing strategy. Though it's best known as a backlink index (which it's great at and I'll get into that), coming up with good content ideas is one of the things I get the most use out of it with using the content explorer. I find articles that do well for the topics I want to target and it's clear what already resonates with your audience which is powerful.
Brian, I have a burning question regarding keyword placement and frequency. You wrote: “Use the key in the first 100 words … “. What else? I use Yoast and a WDF*IDF semantic analysis tool to check the content of the top10 rankings. Pretty often I have the feeling I overdo it, although Yoast and WDF/IDF told me I use the focus keyword not often enough.
One thing I don't like is that Ahrefs sometimes does not provide exact keyword search volume. Instead – it provides approximate numbers which confuses us in cases when we think a keyword should get more traffic that it actually does once the SEO content is published. To get the most up to date and exact numbers, you'd better off use Google's keyword planner.
I thought I was the only one confused between these two tools. I wasn’t sure which SEO tools to use and whether I should prioritize Ahrefs over Semrush or the other way around. I know they have different features. When it comes to keyword research, Semrush is better, but for backlink analysis, it’s Ahrefs. This comparison helped me decide which one to get. Thanks for the article! The comments above also helped me in my decision.
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