The Western Digital WD Black SN850X 4TB is the objective winner of this comparison, securing more individual specification victories than its counterpart. While both drives share several identical technical characteristics, the 4TB model provides a significant advantage in total storage space, offering 300% more capacity than the smaller version. This substantial increase in volume makes the larger drive the superior choice for users who prioritize maximum data density and long-term storage overhead for their systems.

Choose the Western Digital WD Black SN850X 1TB if your primary goal is to minimize your initial expenditure, as it holds a 79% advantage in MSRP. This option is ideal for budget-conscious builders who require high-performance storage without the need for massive capacity. Conversely, select the 4TB model if you require extensive space for large libraries or professional workloads, as the increased capacity is the most impactful differentiator between these two storage solutions.