This is indeed a question one have to ask from time to time.
I have been running kxstudio for a very long time and are in the process of changing some of my music related machines from 14.04 which is the latest official falktx distro
Since I depend on kxstudio repos my options are limited to Debian or Ubuntu and right now I am more inclined to go the Debian route.
The main reason for me to switch is U-he plugins that seems to require newer gcc API/ABI to work. Also Mixbus is freezing on the same machine so I suspect newer libs and kernel drivers might get me a more stable environment.
Any valid reasons to go the Ubuntu route, ya think ?
/Anders