Which Operating System is best for freeRADIUS

[Gunther]

Building my FR server, I have the choice of a number of operating system for
my FreeRADIUS server.
Anybody with a suggestion which operating system is best suited for FR?

I like to run FR on a VPS (virtual private server) using one of the
following OS:
- FreeBSD 4.9 (jail)
- FreeBSD 5.2 (jail)
- Fedora 2 (virtuozza)
- Redhat AS3 (virtuozza)
- Redhat 9.0 (virtuozza)
- CentOS 4.0 (virtuozza)

Thanks!
Gunther