The best is SY4 - because you can built largest ships
In your case SY1 but check the length of the shipyard and the length of the freighter that you want to built.
Cheapest - SY1
Station- cause you dont need to descent anywhere
All in all check rules about production or CPM DATABASE about the which is cheapest
''If gods do exist, we need to start looking for ways to kill them''
I like the Sy 2 myself. Best all around station. If you really need the extra space then go up to the size you need but it's pretty rare to need a Sy4 tho it does have a larger rm cap so less trips to load rms once it's loaded up.