The Western Digital WD Black SN850X 1TB wins in 4 out of 7 comparable specs, with 1 tie. Its biggest advantage is DRAM Cache (100% better).
WD Blue SN5000 4TB wins in 2 specs (Capacity: 300% better).
Recommendation
Choose WD Black SN850X 1TB if you want the best overall performance — especially dram cache.
Choose WD Blue SN5000 4TB if capacity matters more to you.
