When many products need independent replenishment or picking, selective pallet racking can make access straightforward across a broad SKU range. That flexibility uses aisle space, so the layout must still account for travel paths, equipment, and the number of pallet positions the operation needs.
Drive-in racking can concentrate storage by allowing a lift truck to enter the rack structure. It can suit larger groups of similar products, but product rotation, loading sequence, and access expectations matter. It is not automatically the better choice just because density is a priority.
A site assessment or CAD review gives those choices context: the building envelope, clear height, columns, doors, load requirements, inventory profile, and workflow all inform a practical layout.