My 2 cents: Debian Testing -still- manages to be completely ignored when it's a good apples-to-apples comparison to whatever new version Ubuntu puts out.
I have been using Debian for about 10 years (first stable, later on testing). I was mostly happy, but
... about a year ago I migrated both my work, and my home desktops to Ubuntu.
At home it was the result of the simple experiment: I downloaded Debian Testing install CD, put it into my newly built machine and got some ugly failure messages (caused by SATA hard drive IIRC). I downloaded Ubuntu disk and it worked without any problems. Point taken.
As apt-get turned out to work as always, I decided
I feel at home.
At work some testing upgrade was updating glibc in such a way, that the system crashed and I remained with unbootable system which I did not know how to repair. Debian testing CD again turned out to have problems with SATA disks, so I finally installed Ubuntu and moved my data over.
As a bonus I found that both my LCD monitor and my sound card (which both required many hours of googling to configure properly on Debian) just work.
