The Western Digital WD Black SN850X 1TB is the objective winner of this comparison, securing more individual specification victories than its competitor. While the Samsung 990 EVO Plus 1TB holds a 25% advantage in PCIe generation support, the Western Digital WD Black SN850X 1TB provides a more significant performance edge through its DRAM cache, which is 100% better than the alternative. This hardware distinction makes the latter the superior choice for overall technical specifications.

Users prioritizing the inclusion of a DRAM cache should select the Western Digital WD Black SN850X 1TB to leverage its substantial advantage in that category. Conversely, those who specifically require the higher PCIe generation support offered by the Samsung 990 EVO Plus 1TB should opt for that drive instead. Your final decision should depend on whether your primary requirement is the superior cache architecture or the specific PCIe generation compatibility provided by these respective storage components.