Choice between a multi-purpose knife, a 2-blade cutter and a set of 2 1-blade cutters

Multi-use knife:
For cutting carpet, cardboard and paper
With trapezoidal blade and hook
Slider for blade extension
Slider for automatic blade retraction
Button for quick blade change
Convenient storage of 2 spare trapezoidal blades
With thread cutter

2-blade cutter:
With carpet blade and multi-purpose blade
Safety lock
Ergonomic handle for a more secure grip
Practical belt case and 10 spare blades
Blades can be retracted into the handle

1 blade cutter
2 rooms
1x small blade (9 mm)
1x large blade (18 mm)
Slider for automatic blade retraction
Slider for blade extension
5 replacement blades of 9 mm in a plastic box
5 replacement blades of 18 mm in a plastic box