The Crucial T700 2TB wins in 5 out of 6 comparable specs. Its biggest advantage is Sequential Write (2169% better).
WD Blue SA510 1TB wins in 1 spec (MSRP: 82% better).
Recommendation
Choose T700 2TB if you want the best overall performance — especially sequential write.
Choose WD Blue SA510 1TB if msrp matters more to you.