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Capacity is only half of this decision. Two drives can both read 2TB on the label and behave very differently once they are filled past the halfway mark, because sustained write speed depends on the controller, the cache design and how much free space is left for the drive to work with.
The notes below cover the choices that change how a drive feels day to day: which slot it goes in, what happens when it gets full, how endurance figures translate into real use, and when two smaller drives beat one large one.