The Western Digital WD Black SN850X 4TB and the Western Digital WD Black SN850X 8TB NVMe SSD result in an objective tie across the evaluated specifications. While both drives share identical performance metrics in three categories, they diverge significantly in their primary strengths. The 4TB model holds a 42% advantage in MSRP, making it the more cost-effective option, whereas the 8TB model offers a 100% capacity advantage for users requiring maximum storage space.

Choose the Western Digital WD Black SN850X 4TB if your priority is balancing high-end storage performance with a more favorable MSRP. This drive is ideal for users who do not require the highest possible capacity. Conversely, select the Western Digital WD Black SN850X 8TB NVMe SSD if your primary objective is doubling your total storage volume. This version is the superior choice for professionals or enthusiasts who need the largest available capacity for their data-intensive workflows.