Arch.
Neat logo, and adding IAmCandy in pacman's config file enables a pacman when downloading packages
But the real reason is that it's on the bleeding edge... if there's a new feature in a program, I can use it today.
And if (when) something doesn't work, I can raise a ticket or even contribute to the work, get it fixed and get on with my life.
Debian and all it's derivatives are still using applications from "years ago".