I’m a big fan of Semrush however I do find the data more reliable for the bigger markets like the UK and the USA as opposed to Australia or Asian sites. I have generally used it in the past when I have specific projects going on in these larger markets as opposed to subscribing continuously. It is actually quite easy to start and stop the subscription. If I had the ongoing need I would definitely have an ongoing subscription.
Check the duration of a campaign: If a competitor has been running an AdWords or any other advertising campaign for a while, there is a good chance it was a success. If the ad copy was only used for a short time, you could assume that either it was not bringing in enough traffic or it was because that was relevant to just a specific fashion, holiday or event.
Here’s where SEMrush pro free account comes in handy. When you enter any of your competitor’s website URL in the backlink section on SEMrush, it gives you the details of the Page Score (newly launched this feature), the titles of the backlinks and URL’s of source along with all the additional details like Anchor text, External links and Internal links to the URL you enter.