One advantage of using WebDynpro is less coding, second advantage is complete adherence to MVC architecture which is automatically provided by the framework. Apart from that if static development of UI then less work to be done. If some data connection has to be done and that Datasorces, has a direct interface with the webdynpro models then no need to code for explicitly connecting to datasources etc.
it is just the decision before the development of application which way to go with. Both the techiniques are good. But both have there different set of domain for their application implementataions.
With Web Dynpro, you build professional, highly interactive, Web-based, and accessible user interfaces for business applications. With the portal, you provide role-based, secure access to any kind of information (structured or unstructured), services and applications via a Web browser. In SAP NetWeaver, these two technologies converge, enabling you to run Web Dynpro-designed content in iViews from within the portal.
EAR is a Enterprise application archive and it is deployed on to the WAS server through your Software Deployment Manager.
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