Pros: SEMrush is our primary SEO tool and it really does it all, especially with the massive upgrades in the last year. It tracks keyword ranking positions, offers a few keyword research tools, and compares the domain to others related to it. You can automate reports that are white labeled, too. It also does domain analysis, backlink tracking, and site audits which we use all the time in our SEO business. They have recently rolled out link opportunity and outreach tools as well as brand monitoring on social media, though we haven't used those as much lately (but plan to).
Now the Domain vs. Domain tool is a rather unusual visual tool which allows you to compare up to 5 different domains. You can then compare and contrast data from all of the domains. It is handy for SEO experts who want to conduct and later update their competitive analysis of the industry and where they fit in. The Venn algorithm uses diagrams and other essential bits of data to give you a pretty good idea of where your website is placed in the grand context of the niche.
The overview section is the place where you can find everything you need to know about your website. It’s complete with numbers, graphs, and anything you need to see regarding the changes happening to your website. As an SEO professional, you need to be capable of adapting your SEO campaign on the spot. And with the data provided by Ahrefs, you’ll immediately know what to do to improve your site’s performance.

SEMrush’s Marketing Calendar is a work in progress. It isn’t the most powerful tool which will make it worth a purchase yet. Though if you’re already part of the SEMrush ecosystem, this is free for you to use. But it is only useful if you’re managing multiple campaigns. Plus it falls short in the sense that it does not prompt you about approaching deadlines, and events which would be a useful feature in a future update.
Utilize the "broken backlink" section. Utilize the ability to isolate lost and gained links by date. Let's say you have drops around October. You could go to right before that and specifically isolate good links lost or bad links gained, etc. They also have a good amount of helpful online resources for learning how to use the tool. Great graphs show overall trends for linking domains or linking pages. Check out the ability to sort by AHREFS' quality statistics to help analyze quality/low quality links.

There are numerous SEO tools out in the market, however, if link building is the topic at hand, then I honestly think that using Ahrefs is enough. Starting with the dashboard – just input the details of your site and your keywords, then it will give your potential competitors. It’s easy to use and it also has one of the best features for finding broken links, curating skyscraper articles, and link reclamation.
We have done the comparison posts around these tools here https://bloggerspassion.com/semrush-vs-ahrefs-review/ and here https://bloggerspassion.com/moz-vs-semrush/. Please go through both the review posts and go with the SEO tool which fulfil your needs. You can also try Free trial for these SEO tools. And go for the premium version of a SEO tool which you feel is best for you.
Another advantage of using Ahrefs is their “Fresh Index” “Live Index” switch that displays backlinks that Ahrefs’ crawler found. The main difference between the two is that the Live Index is updated every 15-30 minutes to show live links in your site. For Fresh Index, it is updated at a much longer timeframe, but it still displays dead links which give you the chance to reclaim or change the dead link.
Pros: Mostly all SEO Specialists nowadays are using SEMrush (in combination with other tools), and it is effective either for your small personal site or blog, or ever for larger corporation sites. On SEMrush you will find different tutorials in order to get started, SEO audit check, plenty of features in order to analyze your keywords rankings, organic traffic, PPC progression and how to analyze your competition.

Another function included in the backlink profile section is the data for Referring Domains. Basically speaking, it shows you the number of websites that are linking to the domain you’ve inputted in the search bar. So, in this instance, I’m using seo-hacker.com as the target website/URL, and the number of referring domains is shown with the corresponding details you will ever need:
Pros: SEMRush provides loads of actionable data from SEO to PPC to Social. I use it a lot for Internet Advertising / PPC research on what competitors are doing - what are their ads saying, what keywords do they target, what is their estimated ad spend, etc all in one place. It helps with not only search ads - but also display ads - this super feature helps us understand what the competition is up to. It helps in keyword research for organic SEO as well as paid traffic. In terms of SEO it helps track position on organic search results (SERPS), SEO audit including technical stuff and backlinks. 
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