Difference between ITS and web dynpro abap

Hi Experts.
Can any explain me what is the main difference between  EWT/ ITS and web dynpro abap. Basically i am going to developed some existing EWT in webdynpro ABAP , so i want to know what are the advantage of WD ABAP over ITS .
Thanks in Advance.
Satya

Closing thread, thanks for your help.
Thanks,
Satya

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