The Western Digital WD Black SN850X 4TB is the objective winner of this comparison, securing five out of seven total spec victories. Its most significant advantage over the competition is its sequential read speed, which is 109% faster. While the Samsung 970 EVO Plus 2TB remains a viable option, it only leads in one category, specifically offering a 68% better MSRP. These metrics confirm that the former provides superior raw performance capabilities across the majority of tested specifications.

Users prioritizing maximum data throughput and high-capacity storage should select the Western Digital WD Black SN850X 4TB for their system. Conversely, the Samsung 970 EVO Plus 2TB is the appropriate choice for budget-conscious builders who prioritize a lower MSRP over the performance gains found in the higher-tier drive. Choosing between these two components depends entirely on whether your primary requirement is the significant speed advantage of the former or the cost efficiency of the latter.