I guess really all blasting is media,as sand,soda,and plastic etc., are all just different medias used for blasting.
I use superfine copper slag,and I stay away from any large flat areas,such as door panels,roof,hood,and trunk,those areas are easy enough to hand sand anyway.
Soda blasting here is very expensive,and I'm told that soda is corosive and must be neutralized with chemicals after blasting.
I've also used walnut shell,but it won't remove rust,and some paints are very resistant to it.
I've also found that some medias can embed particles in the metal,so I go over the whole thing with 3M pads to remove them afterwards.