This would depend on what you are looking to store and the conditions for storage.
Chrome wire shelving has a high resistance to rust, dust, and damage and it is the best choice in terms of strength for the value. The openness for wire shelving provides a great choice if you need ventilation.
However, stainless steel is the most sturdy, water-resistant and is also best used for high temperature fluctuations. The disadvantage is the cost of steel shelving is very high, as it is unquestionably more expensive than chrome wire shelving.