What’s your favorite App Server?

If you are like me, you have worked all your life around a JVM + App server. From JDK1.2 to now Java7 And from J2EE to now JEE6. While we started as the Sun loyalists, somewhere in 2004/2005 - Spring became more popular, clearly killing Entity Beans also to some extent EJBs? Fast forward 2013 now as it stands, many competing stacks with JEE footprints

 1. JEE (Full profile) - Weblogic12c, Glassfish3.0, JBOSS AS7.1/EA6.0P, WebSpehere8.0
 2. JEE (WebProfile) - ApacheTomEE4.0 more here
 3. Servlet Containers - Jetty, tc server

To see the difference between JEE Web-profile and Full profile please see towards end of this page here (main difference are JMS, Web service technologies, JCA, Full EJB etc not included in Web profile)

 Now based on these Java platforms we have a number of PaaS coming up

1. Cloudfoundry from vmware based on tc server
2. Oracle Java cloud  based on Weblogic
3. OpenShift (JBoss cloud) based on JBoss EAP (or the new name Wildfly)

 (Not to forget Apache, MuleSoft and other open source platforms supported on AWS like IaaS)

Fight for Java PaaS is getting quite hot with the 3 major app server based PaaS providers try to win market share. Who will emerge winner? Your views?