From http://portlets.blogspot.com
...asking which portal is easiest to use. Here is normally what I suggest to people:
1. Looking for easy to use portal - Stringbeans, and eXo 2. Looking for lots of out-of-box portlets - Liferay 3. Looking for portal with extendible architecture and standard support - eXo 4. Looking for good JSR 168 compliant portlet container - eXo, and JBoss