It doesn't matter which free distribution you use. FSF/RMS tends to point
people to Trisquel because it is a free software distribution that also is
easy to install/use comparatively. Its also kept more up to date and has
fewer issues that a less technical user might have to deal with.
Here is a list of good distributions:
http://www.gnu.org/distros/free-distros.html
Parabola GNU/Linux and Trisquel seem to be the distributions to go with if
your a free software user. Both are modern and updated often. Parabola
GNU/Linux is definitely for more technical users. Its advantages are it is
kept more up to date (bleeding edge) software than Trisquel. It is a rolling
release distribution which basically means you get upgrades freequently. The
dissadvantage to that is there is a higher risk that things stop working. It
is also much harder to install.
I think ?most? of the other free distributions are not terribly good fits.
They have various issues including: not getting updated (you might go years-
if ever without an update). gNewSense is an example of this. Some may be
discontinued or abandoned. The other problem is some of the distributions
have no real user base. This is a problem because bugs don't get noticed or
fixed. Trisquel has it a little bit better. For example the AR9170 firmware
got into Trisquel. That made it possible to use some USB N wireless adapters.
Even Fedora doesn't have good support for the AR9170 USB N adapters. So this
says a lot.