The SK Hynix Platinum P51 2TB wins in 5 out of 7 comparable specs, with 1 tie. Its biggest advantage is Sequential Write (219% better).
P3 Plus 2TB wins in 1 spec (MSRP: 63% better).
Recommendation
Choose Platinum P51 2TB if you want the best overall performance — especially sequential write.
Choose P3 Plus 2TB if msrp matters more to you.