Originally Posted by Marks
Linux is much faster
This is not true! Windows 2003 x64 is an amazingly fast platform and can easily perform as well or better "with optimization" than any 64 bit Linux platform.
As for the OP's question. What Linux platform to use out of the three.
CentOs if your going with Hsphere CP.
Fedora-Core with anything else.
RedHat if you have money to spend and require lots of assistance.