Blockboard is a type of board made by wooden pieces inserted between ply of hardwood which bonded together under a high pressure and temperature.
Plywood is used in both for home as well as for commercial purpose and it is less expensive and flexible. This can be used for home décor, paneling, roofing, lining, flooring, and furniture. The plywood does not have grains so it is finished with paint. In case you wish wood grain finish and polish style then you would need to put veneers or teak ply on it
Buy plywood from a good vendor otherwise lower quality plywood may peel into layers after extensive use
HDF is the best board when compared with particle board and MDF. Still a lot of carpenters prefer wood block board compared to HDF as they are more confident about the nail holding capabilities of natural wood whose blocks are used to build the block board