The Samsung 990 EVO Plus 2TB wins in 5 out of 7 comparable specs. Its biggest advantage is Capacity (100% better).
KC3000 1TB wins in 2 specs (DRAM Cache: 100% better).
Recommendation
Choose 990 EVO Plus 2TB if you want the best overall performance — especially capacity.
Choose KC3000 1TB if dram cache matters more to you.