The Samsung 9100 Pro 2TB wins in 5 out of 7 comparable specs, with 1 tie. Its biggest advantage is Sequential Write (168% better).
980 Pro 1TB wins in 1 spec (MSRP: 48% better).
Recommendation
Choose 9100 Pro 2TB if you want the best overall performance — especially sequential write.
Choose 980 Pro 1TB if msrp matters more to you.