What's the best distro of linux?

I have used Kubuntu, because I love the KDE... but also fedora is not bad

Fedora has KDE as well, so if you prefer it anyway why won't you give it a try. I have also read very good reviews about openSUSE.

Right !!.As a newbie found Ubuntu a superb Linux alternative for windows. But over the time I find OpenSuse and CentOS as a more satble one.

LOL, that's funny. Windows certainly can piss you off once in awhile. I've found that it runs a lot better without antivirus and antispyware (you still need firewall, and you need to lock the core): http://invincible-windows.blogspot.com/ But it's still slower and clunkier than Linux any way you slice it, and one wrong move can mess it up. One skill I find indispensable if you're a download junkie in Windows is drive imaging. Then you have to defragment, clean the registry, reboot after Patch Tuesday, and hope their patches don't throw your machine into a blue screen or reboot cycle! You make a good point: "If it's not broke, don't fix it." If Ubuntu meets your needs, and does so without problems, what's left for you to look for? Ubuntu is my distro of choice, too. Of course I'm dual-booted with XP, but I only use it for projects that only Windows apps can handle. And since I have it locked down, I simply turned off automatic updates and leave it alone. For personal use, Ubuntu is so much more convenient. Salute!

Uh... ok thx

Yep, but not for me :P