The Western Digital WD Black SN8100 1TB wins in 4 out of 7 comparable specs, with 1 tie. Its biggest advantage is Sequential Read (104% better).
WD Black SN850X 4TB wins in 2 specs (Capacity: 300% better).
Recommendation
Choose WD Black SN8100 1TB if you want the best overall performance — especially sequential read.
Choose WD Black SN850X 4TB if capacity matters more to you.
