I'm going to both agree and disagree with everyone here. ;)
In seriousness, I don't think it's a bad idea to mention we like Ubuntu as a project as long as we are very clear about why (as designers who use Inkscape), we like Ubuntu best.
Reasons (as a designer) I love Ubuntu are these:
1. Corporation-backed distro has more money to throw at improvements, so investment in Ubuntu is assured for the long term
2. Ease of install, and excellent driver support for most machines.
3. Lots of flavours of Linux are based off it, so you have a choice of pre-built environments.
4. It's free, and has ppas, which make testing Inkscape-trunk a true walk in the park, so I can have all the new features of Inkscape to test and play with in production without the hassle of trying to compile it myself. Also, reverting to stable release is a one-command affair, so it's never a worry that I'll have an unusable ver of Inkscape, even if something experimental goes pear-shaped.
5. It makes older machines run like brand new machines, so it saves me both time, money and supports re-use and recycling of things that would just be sitting in a landfill.
6. Can be used completely on a USB key, so you can use public computers to do your work, with your own OS and Inkscape on your keychain.
7. Ubuntu is very light-weight and installs in under 45 minutes in most cases, so even if my computer dies, I can be up and running again in less than an hour on a new machine, or possibly less than 5 minutes if I have a USB key and enough RAM.
8. Active, helpful community of people who care about eachother and are eager to help, with lots of forum websites dedicated to enhancing the Ubuntu experience.
9. Gnome shell. <- Big one.
Maybe we should do a video to show the advantages.
My thoughts.
-C
If we are going to recommend any distro, It's got to be absolutely pain free to install. Ubuntu is much easier to install than Windows, so it gets my vote.