I'd suggest an eq6, its beefier (a 10" SCT is no light thing to move around). I don't like the CG5's tiny dovetails to hod up to a 15kg load - shudder at how narrow they are.
Both should have similar PE +/- 22 arc seconds, but EQ6's often have a controller that provides PEC.
With the right cabling and EQ6 hand controller - both can be autoguided with the right gear (OTA, CCD, cables and Guidedog, PHD, MaximDL etc), PC controlled under ASCOM -> freeware (Cartes Du Ceil) or professional (e.g. The Sky6 Professional Edition) astronomy packages
and both have goto.
The CG5 I bought was great value for around $1,100 the EQ6's with goto are around $1,499 from Andrews Comms now with a reasonable goto hand controller.
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