I have a linux website which I am planning to move to a dedicated virtual hosting. I am wondering about the linux distro. to use? Should I try ubuntu or fedora. Please comment.

For servers, you probably want an emphasis on reliability, and long term support. For that, I don't think anything beats RHEL. It is all very well tested (so older), and interoperability is strong. For server-oriented hosts, I would (do) use RH every time (and probably only for servers).

--- rod.

What do you use for everything else? What have you used in the past?
If I am placing a business critical web server, and consider it at-risk, I want RHEL for support. I also want contracts in place for the hardware, redundant power, network backups with point-in-time recovery, and IDS.
If it is not for production, I can choose to go with a lot less protection. CentOS might be an option if I do not require OS support.

I support many web servers that act ONLY as a restricted portal into a secured database server. For these the OS is really not important. Everything critical on the web server can be backed up by backing up some settings and configuration files, and with that I can recreated, clone, or replace the web server within minutes on any unix like OS. For these I do not run RHEL or pay support costs.

You have to evaluate the functions, features, value, and risk to make those decisions, and it is a question that a technologist alone cannot answer. This is, in part, a business decision. I do not think that you could provide enough information here to allow any of us to decide for you, nor would it be a wise thing to do if you could.

I'd use a server grade OS instead of a user type. Suse or Opensuse or the RH or clones of. Gentoo may be a stable choice too.

I am making a huge assumption that you are on some linux OS now.

WE could go round and round talking about what is better, blah blah, but I did want to chime in on this one because of my experiences. I primarily use Linux for Web servers.

Debian has been my go to OS for servers since 2009.
I have run Fedora, Ubuntu, and CentOS (I did like CentOS, though) but for ease of use, stability, and the amazing amount of packages availble to you, Debian is the answer for me.

Just my 2 cents.

We've used Slackware, Debian and CentOS for production servers. All have been stable and reliable. Much of a server's stability once the OS is installed is up to the admin.