Samsung - 990 PRO 2TB vs WD - Black SN850X 2TB

These two are nearly even on the Mars Score (70.1 vs 69.4). The decision isn't about overall quality — both clear the bar — it's about which specific trade-offs fit your use.

Pick the 990 PRO 2TB if you care most about sequential write and sequential read. The biggest gaps in its favor are sequential write, sequential read.

The Black SN850X 2TB similarly doesn't carry a headline advantage on the popular specs — look at the full table for category-specific deltas.

Both ship with comparable capacity, interface, endurance (tbw), so those specs don't separate the two — focus on the differences below.

Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity tells you both are well-rounded; the differences are about trade-offs, not quality.