Cryogenic Oxygen plant is 2 to 3 times expensive than PSA plant. But the advantage of the Cryogenic plant is that the quality of the product is much better than that of PSA. Moreover in the cryogenic plant, we can have multiple products from the same plant (Oxygen & Nitrogen, in both liquid & gaseous phase), but in the PSA plant we can have a single product, either Oxygen or Nitrogen gas.