The most accurate way is with a station...however the best way is up to personal opinion. I personally still say a station for this reason...wheels warp. So if you check your camber as the car sits then just rotate the wheel a little bit you will get a different camber measurement. So there really is no accurate "as the car sits" measurement since it will change as the wheel rotates. So the best way to get a setup that you can repeat and always get the same results is with a station.