The Western Digital WD Black SN850X 4TB is the objective winner of this comparison, securing victories in four out of seven evaluated specifications. Its most significant advantage is its endurance, which is 100% better than the alternative. By offering double the total bytes written capacity, this drive provides superior longevity for data-intensive operations. While the Western Digital WD Blue SN5000 4TB remains competitive in specific areas, it cannot match the durability profile established by the higher-tier model.

Users who prioritize long-term reliability and heavy write workloads should choose the Western Digital WD Black SN850X 4TB to take advantage of its superior endurance. Conversely, the Western Digital WD Blue SN5000 4TB is the better option for budget-conscious buyers, as it offers a 47% better MSRP. Selecting between these two drives depends on whether you value the increased lifespan of the premium model or the immediate cost savings provided by the more affordable alternative.