Three years after, but adding another view for anyone else asking.
Having done a few Scale Scenes and the free signal box from Smart Models (with the pre laser cut backing) it has to be Scale Scenes. There is more logic to the approach - more thought on how things like walls need to wrap and built in with margin for error for those of us not so expert. Smart Models has been a fairly unsatisfactory experience. I enjoyed every minute of Scale Scenes, but not Smart Models.Scale Scenes may seem less complex but the end result has been much more satisfactory. A little more effort in the pre planning of the modeling design might really help.