Both setups – if given the same number and types of products – can hold the exact same number of items/skus. The layout on the left takes up about 20% less floor space, allowing you to maximize your total warehouse space far more efficiently. If you have a lot of large products (or ones that you stock a lot of), the layout on the left is more a far more optimal setup (and probably Pallet Racking Sydney is a good idea for those shelves). If you carry a lot of small products (and you can ensure picking from the right AND left sides of the row), then the layout on the right is better for you (and probably normal shelving – not Pallet Racking Sydney) is your optimal setup.