I think you may mean the Ego 9 (there have only been three editions of the Geo, it's sister marker)
A speedball marker is going to be lighter, more compact, smoother to shoot, capable of higher BPS, more adaptable (ie programmable and adjustable via the circuit board) and a better marker all round than a "Woodsball" marker. And, despite the myths saying otherwise, it will cope fine with the tough life in the woods.
Apart from a few, the main advantage is simply the "look" - a woodsball marker is always more realistic if you want to look like you own a real military firearm. Other than that, speedball every time