properly installed and protected, I don't think either is better. Steel and Aluminum will both corrode in water, and even faster with Cl added- so either must be painted/epoxy coated or something. They might "pickle" Aluminum...
Ships are made from Steel, with little aluminum- I think that's for ease of welding as much as other issues.
Aircraft are made from Aluminum and some special alloys- for weight conservation.
So structurally, either is fine; I think both are fine for pool structure also!
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