I often get requests for a deployment breakdown of the OS/Appserver for LC applications so here we go. Remember these may be skewed slightly and should be used carefully. For example for a large enterprise deployment I'd not recommend JBoss. Windows is more performant than Solaris. There are a lot of variables in play but this should give you a good starting point. These are in order, JBOSS is #1 ect....
(58% JBoss) 90% Jboss Windows / 10% Jboss Linux
(28% Websphere) 46% WebSphere AIX / 27% WebSphere Windows / 14% WebSphere Solaris / 13% WebSphere Linux
(14% Weblogic) 46% WebLogic Solaris / 38% WebLogic Windows / 16% Weblogic Linux