Which plattform do you recommend I run PostgreSQL for best performance?

Hello

I am doing a comparison between MySQL and PostgreSQL.

In the MySQL manual it says that MySQL performs best with Linux 2.4 with
ReiserFS on x86. Can anyone official, or in the know, give similar
information regarding PostgreSQL?

Also, any links to benchmarking tests available on the internet between
MySQL and PostgreSQL would be appreciated.

Thank you!

Tim