The Western Digital WD Black SN850X 4TB wins in 3 out of 7 comparable specs, with 3 ties. Its biggest advantage is Capacity (300% better).
WD Black SN850X 1TB wins in 1 spec (MSRP: 79% better).
Recommendation
Choose WD Black SN850X 4TB if you want the best overall performance — especially capacity.
Choose WD Black SN850X 1TB if msrp matters more to you.
