The pricing policy. I purchased the tool for 12 months in end of Jan 2018. This included 5000 SERP updates with a standard plan and all of a sudden, Ahref changed this back to 1000 without any warning. Their pricing page wasn't even reflecting this change, and I was informed about that when talking to a support rep. I understand the Company wants to increase pricing based on improved tools, but when you have made a 12 months purchase in advance, you would expect this new pricing to apply by the end of your contract at least... Or potentially to be grandfathered in the old pricing. But No - Ahref will basically apply this very aggressively with no warning at all or heads up. It's sad, in fact very sad as it shows the company is definitely not customer-centric.
Cons: To an untrained eye, SEMrush can be a little overwhelming just because of the amount of data everywhere on the screen. It took me a whole week just to have some understanding of the program when I was first introduced to it. Even 2 years later..and I still find new things I didn't know before. So is it a con? Maybe not so much but to some it could be.
If you are looking for keywords in languages other than English, you will find Keyword Tool's features very useful. Keyword Tool allows you to pull keywords from 192 Google domains and use 83 Google language interfaces to generate keyword suggestions. That way we make sure that the generated keywords will be relevant to the country and/or language that you are creating your content for.
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.