9.0.4.x vs 10.1.2

We are preparing to migrate fron 9iASR2 to 10g. What is the difference between the R1 of 10g and R2? Is there a reason not to migrate directly to 10gR2?

There are several hundred new features added to 10g R2 across the breadth of the application server. Many of which are good reasons to upgrade.
For Portal new features check out the new features white paper http://www.oracle.com/technology/products/ias/portal/pdf/overview_10gr2_new_features.pdf
It covers both 9.0.4 and 10.1.2.
Regards

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