For ESS which one is better ? (Webdynpro for Java or Webdynpro for ABAP)

Hello ,
For developing Employee Self Service(ESS) which one is preffered Is webdynpro for java and webdynpro for ABAP ? Why ?
What are the differences ?? Please give me clearly.
Thanks
Risha

Hello Olivier  ,
Thank you  for gvg quick reply.
For dessert which one is preferred : apple pie or chocolate pudding ?   - I  am not able to decide
Actually I have requirement for developing ESS in Portal. I am new to ESS and heard presently using WDA for ESS.
I did't get reasons why using WDA. basically I am from WD for Java.
If possible give me differences.
Thanks
Risha

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