The Western Digital WD Blue SN580 2TB is the objective winner of this comparison, securing victories in four out of six measured categories. Its most significant advantage over the Western Digital WD Blue SA510 500GB is its sequential write speed, which is 714% better. While the smaller drive maintains a lead in MSRP, the substantial performance gap in write capabilities makes the larger drive the superior option for users prioritizing speed and capacity.

Choose the Western Digital WD Blue SN580 2TB if you require high-performance storage for demanding write tasks and need the extra capacity. Conversely, the Western Digital WD Blue SA510 500GB is the appropriate selection for budget-conscious buyers who prioritize a lower MSRP over the significant sequential write speed advantage offered by the alternative. Select the drive that best aligns with your specific needs for either cost savings or raw performance.