The SK Hynix Platinum P51 2TB wins in 3 out of 7 comparable specs, with 3 ties. Its biggest advantage is Sequential Read (320% better).
970 EVO Plus 2TB wins in 1 spec (MSRP: 54% better).
Recommendation
Choose Platinum P51 2TB if you want the best overall performance — especially sequential read.
Choose 970 EVO Plus 2TB if msrp matters more to you.
