The Western Digital WD Black SN850X 4TB is the objective winner of this comparison, securing five out of seven total specification categories. Its most significant advantage over the competition is its storage capacity, which is 100% better than that of the alternative. While the Western Digital WD Black SN770 2TB holds a 74% advantage in MSRP, the superior capacity and overall spec-win count establish the larger drive as the more capable hardware option for high-performance storage needs.

Users who prioritize maximum storage space for large libraries or professional workloads should choose the Western Digital WD Black SN850X 4TB to take advantage of its doubled capacity. Conversely, the Western Digital WD Black SN770 2TB is the logical selection for budget-conscious buyers who want to minimize their initial expenditure. By focusing on the MSRP advantage, those with smaller storage requirements can secure a reliable drive while keeping their total investment significantly lower.