The Western Digital WD Black SN8100 1TB wins in 3 out of 7 comparable specs, with 2 ties. Its biggest advantage is Sequential Read (113% better).
KC3000 1TB wins in 2 specs (MSRP: 53% better).
Recommendation
Choose WD Black SN8100 1TB if you want the best overall performance — especially sequential read.
Choose KC3000 1TB if msrp matters more to you.