When to use WEb Dynpro application and Portal application in NW dev studio

I would like to know what is the difference between
webdynpro application  and EP Application using PDK.
Are they comaparable  ...Which one has an edge over the other specific to any applications.
I want develop an application related to e-commerce using the SAP R3 as backend for an industiry(where in a registered user can place an order and query on the staus of order. All the data will be stored in R3 ).
I am planning to dev this using NW dev studio , but have an appehension about which application is useful for this kind of application either webdynpro or EP application .
can anybody explain which one has edge over the other ( Webdynpro or EP applcations in context with NW Dev studio) and why.
thanks
PK

Hi,
<b>Webdynpro</b> is used when requirements ask for a prototype using minimal time n effort.
Highly skilled programmers are not necessary to write a webdynpro application
It uses dynamic controls without reloading the page.
<b>Portal components</b> esp Abstract portal component provides a lean method to write HTML command to web client
Large interactive components requires more programming.
<b>WebDynpro</b> is a highly declarative, tool-based programming model. It minimizes platform-dependent "plumbing" code for building UIs and maximizes declarative metadata describing huge portions of a typical application in a platform-independent way.
Web Dynpro follows a "top-down" approach in order to consistently support multiple runtime platforms.
In Web Dynpro you just have to drag & drop the UI components.
<b>Portal components</b> has followed a "bottom-up", programming-driven approach to Web development.
Regards,
Pooja.

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