Comparison between Oracle BI and Cognos

hi All,
Can anyone tell me about the differences between Oracle BI and Cognos BI(8i)?
Actually at the present time i m working on Oracle BI and later(after few days) i need to work on Cognos BI (8i).
so if anyone has any stuff or link related to the same then please help me out
thanks

Hi
I am working on Hyperion. Really need to comapre Hyperion Vs Cognos
Can you tell me where to get Cognos8.3 installation set up.
Thanks

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