The slow V is not much of an airplane at all. Waste of money IMO. it is only 2 channel with throttle controlling the altittude.
Skyfly gives you 3 channel control so that Elevator controls alltitude. This gives you much more control over the airplane plus it even mixes rudder and elevator for the beginner.
My opinion? If I was looking at the Slo-V I would be just as well off buying a $30ish Airhogs from Walmart.