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These are two common types of storage tanks for storing mainly LPG & also some other petrochemical products.
The choice between a bullet tank and a spherical tank (sphere) is a matter of economics and project logistics. So one is better than the other only in the matter of which has a cheaper overall installed cost.
The sphere of course uses less material than a bullet for the same amount of liquid storage but is somewhat more difficult to fabricate. The diameter for shipping of a storage tank is in the order of 10 to 14 feet depending on the method of transport. This would limit a sphere's storage capacity if it is shop fabricated. For a 10 foot diameter tank, you can get 10 or more times the storage in a bullet than a sphere. For this reason, you usually only see spheres used for very large volumes (maybe in the order of 300,000 gallons or more) because they must be field fabricated to compete with the bullet in cost.
For smaller storage tanks, the bullets are preferred because they can be shop fabricated and more easily transported.
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