I decided to play around with both Java 8 and 9. Java 9 is not supported by NB 8.2, but may be supported in the imminent NB 8.2.1 release expected in December 2017.
https://netbeans.org/community/news/show/1645.html
Currently there are nightly builds of NetBeans taking place.
Are there different builds taking place? In other words two different development teams.
To download a nightly build from https://jaxenter.com/netbeans/using-apache-netbeans-incubating-jdk-9 provides two alternative download URL's:
The Apache Jenkins project https://builds.apache.org/job/incubator-netbeans-linux
The other is a Git-Hub build https://github.com/apache/incubator-netbeans
Are there any differences between the builds?
Which one would be a more suitable build?