Hard Case Luggage's Comes with Inbuilt Security Lock Systems which is more convenient to carry important belongings with you. While Soft Case Luggage's uses basic Zipper Lock Mechanisms.
Hard Case Luggages are more Heavier as they are made with Plastic Fibre or Aluminium, Also they require Addons like Top-Rack to fit on Motorcycle.
Hard Case Luggage's are more Expensive due to the Materials & Features used in them
Hard Case Luggages are best for Crusing and Regular useage, While Soft Luggages are more preferred on Off-Roading & Adventure Rides.
Hardcase Luggage's require modifications like Top-Rack and Saddle Stay, while Soft Case Luggage's can be fixed wither through magnets or straps.