The Samsung 9100 Pro 2TB wins in 5 out of 7 comparable specs, with 1 tie. Its biggest advantage is Sequential Read (185% better).
WD Blue SN5000 2TB wins in 1 spec (MSRP: 66% better).
Recommendation
Choose 9100 Pro 2TB if you want the best overall performance — especially sequential read.
Choose WD Blue SN5000 2TB if msrp matters more to you.