Keyword research is the bread and butter of any SEO campaign. You can’t have a SEO campaign without a defined list of primary and secondary keywords along with long and short tail keywords. It is so important that we don’t think that there is an SEO tool out there that does not have a keyword research tool in one form or the other. However, SEMRush’s keyword research tool is amongst the best.
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.
Overall: Overall, SEMrush is definitely the best in class SEO, PPC and digital marketing tool in general. While other tools can become a little more specialized in a specific field of digital (Moz for SEO, for example), SEMrush allows you utilize one tool for all insights, planning, tracking and reporting at a very affordable cost all things considered.
Pros: SEMRush is a full-fledged powerhouse for SEO building strategy and SEO audits. It's pretty beefy, so I would only recommend it if you have the time and patience for SEO, as the software gives a ton of outlets in looking up actionable items for your SEO Strategy. The first thing that I really liked with SEMRush was the initial SEO audit of my site -- I was able to see what's good and what's bad about my SEO, and the quick errors or warnings for title headers and ideas for gaining more traffic was awesome. Moving on, I found their analytics just as good as Google Analytics, showing me where my traffic is coming from and where I can improve my paid search positions. I haven't used the Social or Content aspects of SEMRush but social listening looks to be baked in well and integrated nicely. If you're in the market for seeing how your organic and paid search traffic plays a part, and then strategizing in how to improve your overall position against organic search and then your competitors, I'd recommend SEMRush.