Why on earth would u choose ubuntu? Unity and ubuntu do suck ass. Havent ever in my life seen an OS uglier than fucking ubuntu.
It feels strange to defend ubuntu (I mostly agree with your view) but I recently started using it myself. Not unity of course, which is thankfully discontinued but lubuntu, which I have on a VM.
The reason is simply support. Whatever wallet I decide to compile or any other linux app will definitely include instructions for a ubuntu LTS. Not debian, not centos, not arch nor any other distro I have used in the past.
Sure in theory we could just install the equivalent packages on the other distro but it's rarely that simple and things often go wrong unless you are an expert and really know what you are doing
I can attest that most support is for Ubuntu. And I think, Ubuntu sucks as well.
But since Ubuntu is Debian based, in my experience, most solutions which apply for Ubuntu apply for other Debian based OS's as well. In fact, in most cases, I first search for "problem x ubuntu", although I use a different Debian based OS.