High skids also give you a better sloping ground capability.
According to the flight manual (EC135T2) they don't.
Slope Left, Slope Right, Nose Up, Nose Down (degrees)
Low Skids: 14, 14, 12, 8
High Skids: 12, 12, 12, 8
With MMI (Mast Moment Indicator) inoperative or not installed : 6 degrees all round.
Any advantage to sitting on High skids (for a Police machine) is removed by having a Nightsun that is only 23cm clear on level ground.