It could be worth your time to take a look at VulnWhisperer (https://github.com/austin-taylor/VulnWhisperer)
It can integrate with various scanners like Nessus, OpenVAS and Qualys. So you can have multiple scanners and view the results in the same interface. The big use case I can see that you can purchase a certified scanner for your internet facing IP addresses while using OpenVAS for your internal environment.
Note that I have not personally tried it yet but I do know the underlying stack it uses (The Elastic Stack) and the reporting and data mining features are solid. Also I am in no way connected to that project, just find the approach to be good.