[Zope] Zope vs J2EE

In our department I have decided (as a CTO) to use Zope for an ecommerce application server. And I also would like to use it for another application for a customer. I will have a presentation about Zope and our plans in a 3-day technical conference of our corporation. Can I have some (primarily technical) arguments why Zope is better to some (especially Java-based) specific web application server tool (WebSphere, Oracle Application Server, Oracle8i, NetDynamics, etc)? I'd be very glad if some of you share his thoughts about the topic. NM