Aluminum tanks have a standardized width, and are much cheaper and lower maintenance than steel, as they will not rust. Yes, even stainless steel tanks will rust if any water gets in them, as not much won't in 3000 psi. However, they typically wear out more quickly (20+ years, but indefinite for steel) and they weigh less - you would think this would be a plus, but it's not cause you need more weight to make up for it.
Addition
Steel tanks are actually lighter out of the water (since aluminum is a softer metal which requires there to be more aluminum than steel in a Scuba cylinder) and more negative in the water (so you need less weight).
Advantages of using aluminum foil are that it is impervious to moisture, gases, light, odors, and bacteria. Disadvantages of using this metal is that it is easily torn and broken.
Aluminium is cheap, has a low density, it is easily recycled, it is not toxic, it is generally resistant to corrosion, etc; any serious disadvantages exist.
Advantages and Disadvantages of equity
* Aluminium is lighter and doesn't rust * Steel is cheap, it is very hard, but can break
there are no advantages or disadvantages
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