I agree that basing on LTS is the logical choice for now, but imo Trisquel
should still look at the potential for switching to Debian in the future -
especially if Ubuntu continues to insist on re-inventing the wheel and using
non-standard system components, e.g. Upstart. It's completely crazy that they
use this while the rest of the world moves to systemd.
Maybe a solution could be found in basing on Ubuntu but with systemd -
there's a wiki page about doing something like that [1]. Not sure how
up-to-date the information there is, though.
[1] https://wiki.ubuntu.com/systemd