These are three different machines that are used in warehouses depending on how you wish to dispose of the cardboard.
The first machine is for avoiding reuse, the shredded 2-inch strips can be easily disposed of without losing its scrap value, it is also very convenient for packing and compression
The second machine is used when there is a lot of boxes for disposal and they don't have to be flattened, they can be directly fed in the machine which tears them into pieces which can be compressed easily.
The third most popular machine is used to convert old corrugated boxes into flexible mats for packaging.
For more details about these machines and which suits you best, pl contact and we shall be glad to assist.