What is the BEST Linux OS ?
I feel undecided to choose among
Fedora
Opensuse
Mandriva
Ubuntu
Kubuntu

Can you suggest? Why it is best of the bests?

Arch - simple, total control, up to date, fun

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My two favorites are not on your list.

First choice: Slackware. Not the easiest, but easily the best. Always works, never breaks. I started with Slackware and I'm glad I did. When you master Slackware, no other distro will ever intimidate you, because you will know how Linux works.

Second choice: Debian.

Both of them are rock-solid stable.

Slackware, despite what you may have heard, is easy to install, as long as you do your own disk partitioning--it does not automate that.

Ubuntu is okay and it is easy to setup and use, but in my opinion it's trying too hard to look like Apple.

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for Windows users, which linux is the best to co-exist?

Fedora

Kubuntu is easier to install MP3 plugins

Your question is the same as "What is the best car?" or "What is the best flavor of icecream?". Simple answer, there is no overall best. The best distro is that that you are liking. For Slackware users of course Slackware is the best. For me it is Debian, but I also like Arch.
There is only one one way to find out, which one is the best for you: Try them all. No one of us can say which is the best for you.

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I want something easier to install and update

Then I would recommend one of the *buntus, Linux Mint or PCLinuxOS.

I would go with PCLinuxOS for your needs also. Its pretty stable and reliable. Also has a huge repository of software.

pclinuxos DVD, i got it.
but not yet tried.

If you want a kinda user-friendly Slackware derivative try Salix OS
http://www.salixos.org/wiki/index.php/Home

basically a customized Slackware 13.1 but it's 100% Slackware compatible and has many extra packages
Don't confuse it with Slackware as the difference is basically the same difference between a stock Mustang and a hopped up Mustang Cobra
http://www.ford.com/cars/mustang/2012mustangboss/

for a very new user to Linux operation systems i would recommend "mint linux" or "Ubuntu "
some folks like "PCLinuxOS" but i have not seen much about it so i do not know if it would fit your needs

instead of asking ? what is the "best" ?
answer : there is none

you might want to ask
" what would fit this list( 1.2.3.4...) of needs and my skill set ( point and click user , experienced MS user , MS all time guru ) "

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I wrote a blog (actually the first and only blog I have ever wrote) that uses an analogy of what I thought about in choosing a linux disto. Linuxville As a new linux user, I still have not chose "THE ONE" that will be the one for me.

Ian

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how about Solaris?