The gso dob is reported to be very slightly better optically, with a slightly better focuser, but not enough to make a serious difference.
The orion intelli controller has an annoying feature of switching itself off after 15 min without a button being pressed. It then requires having to repeat star alignment.
It is powered from a 9v battery with no provision for external power.
There are also some small mechanical issues with the encoders where they can be easily damaged.
I went the cheapest possible route to fit dsc to my gso scope running PalmDSC on an old palm pilot
http://palmdsc.dougbraun.com/
Dave Ek decoder box
http://home.earthlink.net/~david.ek/digicircles/
I was lucky enough to obtain a hardware kit including encoders, mounting hardware and cables from Kendrick in USA designed for the Orion XT "classic" which happened to fit the gso dob.
I think they are no longer available.
Total cost to me was about $400 (including the palm pilot).
An argo navis or similar set up will set you back about a $1000