This is an honest question which I even have used variety of those SEO tools. I currently use Moz but I even have used Majestic and SEMRush within the past. Also, many SEO like Ahrefs group buy.
They are all great and useful SEO tools. i actually like how SEMrush makes it easy for you to urge keywords. SEMrush also features a neat tool (recently added) which can produce a content template supported analyzing the very best 10 results in SERP.
Moz is my go-to tool because the interface is extremely easy to follow! Also, in my opinion, the only tool out there. Their data is super accurate and should be easily compared to webmaster tools. I find it tough to match semrush group buy to webmaster tools.
I like Majestic for tracking backlinks, but I even haven't used it during a short time . However, it’s a superb tool and really affordable. Can’t say much about Ahrefs but SEO’s adore it .
I hope this helps.