I just use the padded soft case. As long as the scope does not make real hard contact with any thing really hard my scopes never have been affected. But then I am using high end rifle scopes. I dropped on of my bows the other day on the concrete and it layed a beating on the scope but it did not shift the POI. So if you have a really good scope on it don't sweat it unless you have to ship your bow.
What I like about the padded soft case is that you can carry your bow and everything else in it. When you get to where you are going you can sit on it too.