We have used Nessus Tenable. We switched to ImmuniWeb because it is competitively a top-selling product, and our clients quickly recognize its value. Interestingly, some clients are willing to pay more for specific, complex issues, showing their commitment to solving intricate business challenges. In a specific instance, Tenable fell short in addressing a problem promptly, whereas ImmuniWeb efficiently assisted us in resolving the issue. 

I used the vulnerability scanner from Acunetix and some Qualys products. The scanner is nice but very expensive. It also didn't give the full view of the problems within the website.

For WAPT and MAPT, we have used for years the consultancies of our Ethical Hackers, who clearly do not compete with ImmuniWeb with regard to times, validation of patching of vulnerabilities, or the Zero False-Positives SLA.