So I'm Wondering. (scary i know)

I've been playing with running iFolder 3 server on Ubuntu Server and
even though it compiles and works I thought I should explore a more
stable solution.

Is SLES 10.x series the only truly reliable platform to use and what
everyone else uses or is it possible to use the openSuSE product with
the same reliability?

I also see a version for Fedora Core 5 is available for download, am I
correct when I assume the "Core" in Fedora means it matches the RHEL 5
version (i.e. latest version) to an extent or is that only a match found
in the CentOS line? (off topic mostly i know)

Finally to maintain a free and easily updated environment is a
particular platform recommended?

Thanks in advance,