A soft lite ball (or a regular lite ball, for that matter) will fly about twice as far as a standard wiffle ball because wiffle balls have holes in them that restrict their flight.
I learned as a kid growing up that they have never made a ball that I could not break a window with. I broke house windows hitting wiffle balls. That said, a lite ball, soft lite ball or wiffle ball would stand no chance at breaking a car window. A lite ball or even a wiffle ball could dent a car. I kind of doubt that a soft lite ball could but I'd have to re-experience my youth to give it a shot!
A soft lite ball is more "spongy", for lack of a better term. It's not as soft as a Nerf ball but more like what a Nerf ball would be like if it got wet and dried, getting harder like a sponge does (somewhere between a wet sponge and a dry one). That's about as good as I can do to describe them.