I'm new to linux, so i want to know which linux distribution is the best one.

If you are asking this question then (IMHO) Ubuntu is problably the best.
It is the most "friendly" for new users.
Welcome to the wonderful world of Linux,
Walter.

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There isn't a best one. There will be one that's best for you and your needs, however. You'll know it when you see it. Keep trying live CDs and/or virtual guest installs until you find it!

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No doubts possible, Slackware

Markus

my vote goes to Ubuntu.

My vote for everything as long as it isn't windows

Exactly.

Now serious, as stated above, there is no best distro, only one that fits your needs the most. You may want to take the tests here or here, they will help you to find your first distro. You can also have a look at Distrowatch, I would recommend to look at least at the first ten in the list (and of course Slackware).
Or you post here what are your aims in using Linux (do you want a server or a desktop system, should be a simple system that is easy to use or want you to learn the ins and outs of Linux) and we can recommend a few distros to you.

In any case, it is up to you to have a look at different distros and decide for yourself which is "the best".

There's a strange habit indulged in by Linux users, not just beginners, called distrohopping. This involves installing different distros, one after another for a few days or weeks each, until they find the one that suits them best. If someone tells you chicken is better than beef, lamb, or pork, how will you know 'til you've tried them?*

* Unless you're vegetarian, then you'll have to think up another analogy.

P.S.
My favourite is Slackware, 2nd favourite is Debian. Which is why I'm dual-booting.

I have not made my mind up yet, that is the reason I have 9 to choose from now. I was booting more but could not keep up with the new releases without spending too much time each day setting them up. Once you get them installed with all the accessories you want they will almost look alike. The window managers and the splash screens are the basic difference. Of course some are easier to install and have larger repositories than others. Like most of them advise take distro watch and download the live cds and see if you are more comfortable with one or the other.

Mandriva or Fedora!

You will get as many different answers here as users.

You can read my blog where I check and review different distros. This may help.

If there was only one best distro, then everyone would use it, and the others would all die off. In other words, only you can know which one is best for you. Just one may not be good enough for all of your needs.

This is the last time I'm going to reply to one of these threads.
Really. Almost for sure.

--- rod.

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Linux is not "one size fits all"
The best distribution for you depends largely on your preferences...some linux distributions let you do just about every thing via GUI, others require varying degrees command line gymnastics acumen...even the GUI differs, there are distributions which are primarily of one type. For instance, Pardus is a KDE distro, Ubuntu is a GNOME distro, Bodhi uses Enlightenment, there are others that use other WMs/Desktops, all this choice is not bad, because eventually you'll be able to settle down for a distribution which suits You best...and then in all likelihood you'll have your own set of tweaks to make to it so as to make feel just right...

As the others have said, try them out(the top10 on distrowatch would be a good place to start)...you'll find yours

Good Luck

Well to answer your question what are you needs. If you are new you would prolly like a good selection of precompiled software. A well worked out GUI such as Gnome or KDE. Good support for your system. A system that will support your hardware. So I would suggest you google Linux distro choser and do a couple and see waht you get and give that one a shot lol.

Yet you registered your account here two years ago, almost to the day.

And after all that time, you ask a question which is akin to asking which is the best flavour of ice cream or the best team in [insert local sports league here].

Interesting.