Why are you using the Linux distribution of your choice?
 

Rock your heart out.

It's a pity you can't tick multiple options. I use mine because it's reliable and fun (chosen fun in the poll).

It's fun. It makes me irresistible to women. It contains no artificial colourings or preservatives. It kills all known germs. It washes whiter.

Yes, that was on purpose :)
Probably a bad time for a poll though, with the 2010 LinuxQuestions.org Members Choice Awards going.

because i dont want to become master for all , so let one or two would do :)

My choice, rpm formats-at least, are the ones work with my AIO Brother printer. I never could get the .deb drivers to work with it.

Besides, it will burp my baby and wash my car also....

Broad-com Tainted Squeeze
 

I use Debian because it is reliable, fun, well documented,free, and "true GNU Linux". Withthe exceptionable of us whom need to install the Broad com-Sta Linux Drivers and yes i am running a "tainted Kernel" of Squeeze.

I also use Squeeze because I prefer to hand roll my own XFCE based desktop and as far as i can tell Distributions like Ubuntu, arch,RHEL and gentoo are gnome or kde and that is it, unless you want to wind up repairing a broken system.

KUbuntu: offers PPA's with latest software, Debian package management and six moths updates.

I have used both RHEL and CentOS. Both are reliable operating systems.

I voted "it offers something others don't"
Specifically I am using Slackware 13.1 as my only OS for creative writing and the things Slackware offers that others don't is:

1) overall bullet-proof stability

2) ease of use

3) applications can be compiled from source and Slackware is hands-down the easiest distro to make a package for.

4) Upgrades are not every day, etc like everyone else. Slackware allows me to do my work instead of bothering with frequent upgrades or other system chores.

5) Super-duper support! No other OS offers the community support IMHO.

The best thing about Slackware for me is you start with a blank canvas and end up with a work of art:)

Should have multiple reasons to use a distribution
 

For me, I use Linux Mint and Fedora because they are both fun, stable, minimum of virus vulnerability, and a wide array of applications. I don't use Windows at all and don't need to with these distributions and applications they use.

I use Ubuntu as it does everything I need, and has been super stable with my hardware. However, if the rumors are true and 11.04 is based around Unity, then I'll be looking for another Debian based distro (maybe even Debian itself!)

How about an option like, "I've been using it so damned long it's become second nature"?

My Linux path went something like this -

1. HJ Lu's boot/root floppies
2. MCC Interim
3. TAMU 2
4. SLS Linux
5. Slackware
6. Red Hat 2.1 - 9.0
7. Fedora 1 - 14

Though I do use CentOS on the server.

Linux gives you freedom

Explaination of my answer
 

I use OpenSuSE 11. To quote and article from ZDnet, "OpenSuSe is the Mercedes to Ubuntu's Volkswagen". Of course I am speaking of "Out of the box", as you can add pretty much all of the same packages in Ubuntu after initial install. I have used both, and still prefer what OpenSuSE has to offer.