It is best suited for integrated security testing of applications which are hosted on web servers. The most important thing is the integration of DevSecOps which is crucial in today's fast paced environment of rapid development. The core of Acunetix is application scanning which is really great and I highly recommend this product to everyone
Nikto is well suited for scanning web server-related vulnerabilities for small and medium enterprises. We can utilise it for checking server default files and security misconfigurations. It is not suited well for some users because it is CLI based tool and not a GUI based. Also, community and OEM support are not available for this tool.
ZAP is a free tool, and adequate. But it is to that extent less friendly. I would not be as confident of the results and it definitely can't produce reports on par with Acunetix. There would be a lot of legwork on our end if we desired to switch to this tool.
Saved money compared to other commercial scanners, especially over the long run.
Scan speed seems to be pretty good compared to some of the bulkier commercial products out there. However, that largely has to do with proper configuration.
A downside is that is requires a bit of extra work just to get it set up to scan APIs, web services, etc.