I never, ever, ever, ever (did I already said ever ?), got any Kernel Panic
on Gnu/Linux (any Distribution included), but maybe I am very lucky, me and
my 10 different machines over the time :D.
Trisquel 5.5 just needed 1 thing to be perfect, and this is the new Kernel
Libre, because with the Kernel 3.0 that ships with Trisquel 5.5 you will have
a lot of problems (like me with Sound, Video, Virtualbox etc.. etc.. etc..).
After that no problems at all to be honest, but once again, maybe it is just
me. As for other distributions, Parabola GNU/Linux is very stable when you
know how to configure everything, the problem is when... well... the new Mesa
and the new X.org 13, but Gnome 3.6 isn't out yet, and because of that all
the Media, Function, Especial buttons don't work at all.
So yes, if you want the most stable Trisquel you have 2 solutions:
1 - Install the latest Linux-libre kernel
2 - Wait for the Trisquel 6 release :D
PS: If you are talking about other thing that Hardware problems then maybe it
is another problem. But in terms of stability, and even if I use Parabola
more than Trisquel, I have to admit that Trisquel is the most fast, stable,
and beautiful distro out there)