Busway favors expansion and backbone distribution; cable favors short fixed runs. Compare on TCO and change-out speed, not unit copper price alone.
On an 800V DC BUS, plug-in tap-offs reduce rework when loads move. Cable remains correct for edge drops and temporary works.
Use both in practice: spine as busway, finals as cable, unless the run geometry says otherwise. Model labour and downtime, not commodity copper alone.