Crown moulding finishes the top of a cabinet run and hides the gap to the ceiling. A simple cove suits a shaker kitchen; stacked crown suits a traditional one.
Match the moulding to the door style and the ceiling height. Tall ceilings can carry a stacked crown with a light rail below it.
Painted crown hides joints well. Stained crown shows the grain, so we cut it from the same lumber as the doors.