I've used both, and other distros, and other Unixes. I don't keep on using Ubuntu just because their leaflets and CDs are shinier. I keep using it because it has less hassles, less fanbois and is more usable.
Not wasting a weekend configuring shit because it already works is a freedom.
Not finding fanbois ready to discuss that "apt is better than rpm, therefore your not debian distro sucks" for hours is a freedom.
Downloading an iso with easy instructions from a polished website, or actually having a CD come to my address for free is a freedom.
Having the system work with most of what I need in a usable configuration in half an hour is a freedom.
Do you need any more freedoms that explain why do I use Ubuntu over Debian?
Apparently, to promote your own distro with your money is a grave misdeed. Fuck me, no, it is not. Sorry you feel suckered into having been their PR, but hey, at least someone started using Linux.
Oh, and responding with 'but all Ubuntu adds over Debian is polish' will get an eye roll. Yes, it might be 'all' it adds. It's still something that Debian hasn't managed to add in years. And it's quite a lot.