The Western Digital WD Black SN850X 2TB is the objective winner of this comparison, securing more individual specification wins than its counterpart. While both drives share the same underlying technology, the 2TB model provides the most significant advantage by offering 100% more storage capacity. Conversely, the Western Digital WD Black SN850X 1TB with Heatsink holds its own primary advantage in MSRP, which is 21% better than the higher-capacity version, making it the more cost-effective entry point.

Users who prioritize maximum storage space for large libraries or extensive file collections should select the Western Digital WD Black SN850X 2TB to take advantage of its doubled capacity. If your primary goal is to minimize initial expenditure, the Western Digital WD Black SN850X 1TB with Heatsink is the better choice due to its superior MSRP. The inclusion of a heatsink on the smaller model also provides a specific physical configuration benefit for users requiring integrated thermal management.