Best Linux Distro, For Personal Computer Use Options

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I've had Ubuntu and Fedora on two of my machines for a good 5 months now. Personally, I've become a huge, huge fan of Linux and I don't see myself switching back to Windows or crossing over to the dark side of Mac anytime soon (aside from government computers, of course).

Well, I just picked up Mandriva and it runs even smoother than the other distributions that I have. My mediocre Dell Insprion 6000 now operates like an XPS or Alienware computer, in terms of speed. After a few hours playing around on the terminal, I managed to install Fruity Loops 7 XXL Producer Edition as well as the racing game GRID. Everything runs smoothly.

Still, I can't seem to figure out which Linux distro is the best. Each one I've acquired has been better than the one before. For the Linux users, what distros are you running on your machines? What do you personally recommend?

edit: KDE is growing on me. I'm still partial to Gnome, but KDE 4.1 looks clean.

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***UPDATE***

I'm currently still sold on Ubuntu as the best Linux OS for PC usage. It's easily customizable, the package manager is excellent, the compatibility with new machines is the best I've run into, it boots quickly and the install is damn near painless.

I've done some playing around with Fedora 9, and I must say that it is an extremely clean and smooth operating system, however, despite the user friendly interface, installing/uninstalling programs and drivers can certainly be a pain in the ass.

Mandriva 2009 (PowerPack) has given me a similar headache, but my main gripe with that particular OS is it's package manager; horrendous.

I sat in the back of a humvee and played around on a friend's computer that was running off of Debian. For you code junkies, you can definitely get your fix. I haven't worked my way around to Gentoo, but what I've noticed about Debian is that you'll spend a considerable amount of time in the terminal to get virtually anything done. That's a good and a bad thing, depending on the user.

Kubuntu just does not offer the support of Ubuntu and, as I said before, the KDE desktop on Kubuntu seems a bit awkward. I'm partial to the Gnome environment because I do like the Mac-like interface. As far as community support goes, the Kubuntu help forums are almost as lifeless as my own personal internet forum; that's certainly not a good thing.

And as for Linpus, well, let's not go there. I'll just write that off as a learning experience for Fedora.

This is just my feedback from personal experience. Depending on what your focus of computer usage is, your experiences with these different distros will vary. Still, I'll stick with Ubuntu and call it a day. Eventually, once my proficiency in this arena increases, I'll step up to the plate and challenge Gentoo.