Linux will provide more memory to the application than Windows will on a basic server (1-2 CPU and 4 GB RAM). These versions will require that the server support two databases and two application server instances--a lot for one server. If you are not being forced to use these older versions of the application server and database, I would recommend that you use the 10g database and application server, placing the metadata repository in the 10g database so that there is only one database.
Dig Deeper on Oracle Application Server
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