Just use the stable one from the repositories , it should be fine.
The latest stable should hopefully end up in the repositories, as long as they are updated regularly.
The latest version currently is
v0.10.25, which was released a week ago*, according to the nodejs website.
nodejs is installed,
dpkg can list the current version:
:~$ dpkg -l nodejs*
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
So in Ubuntu 13.10, the latest version seems to be
0.10.15. According to the
nodejs Changlog, this is the version from
2013.07.25 - the 25th July 2013, so it is half a year old*.
The EtherPad on GitHub shows that version 1.3, the latest version*, was released at the end of October 2013, so as this is only 3 months newer than the version of
nodejs in the repositories, there us probably no need to bother.
Of course, if you wanted, you could download the latest stable version from here:
Though it would be easier to wait for the Ubuntu repositories to catch up Even though that can take a while...
*at the time of writing