I have been using Jboss application servers for almost 6 years (AS and EAP servers). I used to deploy my java applications in Jboss and tomcat servers. When wildfly (8) was released I did not hesitate to move to it. According to my experience the features and performance are greatly enhanced in the wildfly server Also as per my experience the server is very robust and stable.

Drag and Drop option for file upload, multi factor authentication, eco friendly GUI application

I like that there are some free features that allow you to try out some of the applications before purchasing.