The Samsung 990 Pro 1TB with Heatsink and the Western Digital WD Black SN850X 2TB are tied in overall performance, as both components secured an equal number of spec wins. While the Samsung 990 Pro 1TB with Heatsink holds a 5% advantage in sequential write speeds, the Western Digital WD Black SN850X 2TB offers a 100% advantage in total storage capacity. These drives are effectively matched across the majority of their technical specifications.

Choose the Samsung 990 Pro 1TB with Heatsink if your primary requirement is the slight edge in sequential write performance for specific data-heavy tasks. Conversely, select the Western Digital WD Black SN850X 2TB if you prioritize significantly higher storage capacity for your system. Both drives provide comparable technical foundations, so your final decision should depend entirely on whether you value the marginal speed increase or the doubling of available space.