Unified audit pure mode pros and cons

Standard comes Oracle with mixed mode which allows us to use both the traditional auditing as well as unified audit policies. In case one only wants to use unified auditing, there are two options:

1. Just use the default mixed mode, configure unified audit policies (and not issue any traditional AUDIT statements)
2. Relink the binaries to enable pure mode and configure unified audit policies Questions:
3. Are there any benefits of option 2 (pure mode)? I.e., why bother going through the relinking burden if unified auditing can be used in mixed mode as well?
4. Assuming there are benefits, are there also disadvantages in using pure mode?

Regards,
Dirk

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