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.
Support for Multilingual Websites: Keyword research is available in 16 languages i.e. German, English, French, Dutch, Spanish, Italian, Hebrew, Finnish, Danish, Italian, Polish, Russian, Turkish, Norwegian, Chinese and Swedish. So, regardless of the language or region, you’re targeting its possible to find the right keywords to reach them more effectively.
With SEMrush I solved the problem about monitoring main competitor's sources of traffic. Benefits are multiples, I highlight: increase of organic traffic and Google ranking improvements. Technical audits are also very helpful if you work with developers. SEMrush is a all-in-one platform, you can use it for marketing, SEO and Technical improvements.
Cons: The con is a basic con with all SEO/SEM tools in the age of Google. PPC data is rarely accurate in terms of what companies are spending, not the fault of SEMRush as much as the sources are unreliable (yes Google, talking about you), which makes what used to be an accurate measure more of a guess. Still you will get an understanding, but the PPC end must be looked at more from Adwords than trusting this tool, or any tool.
Another feature of Ahrefs that could potentially help you take your campaign to even better heights is their content gap feature. It gives you the option to check which keywords your competitors are ranking for so you can stay one step ahead at all times. Basically speaking, Ahrefs gives SEOs the ability to overtake their competitors through knowing which keywords to target and focus on.