They would have some very similar feeling and response. I've never had a Spyder on the road, have ridden one for a few minutes in a parking lot. There is a mannerism that can compare to snowmobile and (or) wheelers. I have spent a lot of years on wheelers and sleds. With 2 skis in front and 1 center drive apparatus in the back there s some similarity to a sled. And I kinda like the "lift the inside ski, slip the back end a bit" turning style of a sled. Would have to be fun on tires as well. But, I have yet to grow up in any real fashion.
To be honest, I am dying to take a motorcycle and a 4 wheeler to make a road legal ATV. 4 stroke, 4 cylinder, D.O.T. tired, 4 wheeler. With a street bike center section for the VIN. All the legit motorcycle inspection items should get it on the road.