The best Linux distro is probably a BSD variant.
Your OS choice for servers differs from desktops. Security, stability and available expertise is more important than ability to configure. The self compiled Linux distributions available for your desktop could expose your server to attack. You can read more here for reasons why ~ ftp://rtfm.mit.edu/pub/usenet/news.answers/unix-faq/faq/part6
think of BSD as an older, more conservative
and stable OS than the "open-all-doors" Linux ...
You can use Linux, but it takes a bit more work to secure than BSD. For the simple reason Linux is younger, more open and therefore less secure than BSD variants (unless hardened with patches like SE) ~ http://networking.ringofsaturn.com/Unix/bsd.php OBSD and FreeBSD would be my choice. FreeBSD was also the choice of Viaweb. I suppose "Robert Morris" knows a thing or to about securing systems ~ http://www.paulgraham.com/vwfaq.html BSD OS's are safe, secure and have access to the source, support lots of hardware with caveats. Here is a quick choice guide ~ http://www.serverwatch.com/tutorials/article.phpr/10825_3393...Of the Linux servers I'd stick with Debian variants which includes Ubuntu. Debian has their own way of doing things but it is stable, well understood. Maybe SE-Linux is worth a look ~ http://www.nsa.gov/selinux/ and http://en.wikipedia.org/wiki/Selinux
"... i will like to know the best Linux Distro to use as my server ..."
That also depends on what hardware you are using. Is it hosted, your own?? Check your hardware lists before you choose your OS.