The ability to run in embedded mode. The ease of deployment. The fact that it has been around for a long time and has lots of support. I've used other containers like docker but Wildfly feels more integrated into the JVM ecosystem. It's not as easy to use when compared to docker.
If you want something very simple that just works then go with docker. If you want a container that will be around for a while then Wildfly is your best bet. We needed an embedded container that would allow us to runβ¦