The Western Digital WD Blue SN580 2TB is the objective winner of this comparison, securing more individual specification victories than its counterpart. While both drives share identical performance characteristics across four key metrics, the 2TB model provides a significant advantage in total storage space. Specifically, the Western Digital WD Blue SN580 2TB offers a 100% increase in capacity compared to the 1TB version, making it the superior choice for users requiring maximum data density.

Choose the Western Digital WD Blue SN580 1TB if your primary goal is to minimize your initial MSRP, as it holds a 39% advantage in that category. Conversely, select the Western Digital WD Blue SN580 2TB if your priority is doubling your available storage capacity. Since both drives are otherwise equivalent in their technical specifications, your decision should rest entirely on whether you value a lower entry cost or the ability to store twice as much data.