Blasting is okay if you watch the pressure. It is very hard to get all the grit out. I have sandblasted 7 or 8 cars over the years and it depends on the cars metal such as mustang and camaro hoods and decklids, real easy to warp so I don't blast those parts.
I prefer dipping but it is not easy to find a faculity that does it, I have to drive several hours and then wait several weeks to months for the car or parts to be finished. The dipping process gets into areas that blasting or hand stripping just can't get, behind panels and such where rust is present and will work thru to the outer panel. I also re-seal all the seams and joints afterwards which you should do anyway as most of the old seam sealer is cracked and lifting and allows moisture to stay in crevices.
So, if I am doing a high dollar car, I will go the dipping route. If not, look at media blasting if one is available. Or sandblast if you are careful and stay away from hoods and decklids !