Under nearly identical conditions of operation and configuration, on the same hardware with a full wipe and load of each OS, Windows requires less resident memory. Oracle and RHEL nearly ping the 1g memory on the box, whereas it is only half consumed on the Windows box. Installation, with full instructions on a basically certified distro, required weeks of hacking and plugging and swapping to get the dependencies right on Linux. Windows was more or less plug and play in one day.
They appear to perform with equal stability, with slightly easier boot and reboot configuration and operating stability on Windows.
hmm. not looking good for linux long term on my cluster.