This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
For starters, Weblogic and WebSphere cost serious money, while Tomcat is free. Of course, Tomcat is just a servlet container/web server, while the other two are complete JEE servers that have oodles of other features Tomcat doesn't.