The best opposing position group the Giants will face in 2017 is the Cowboys' offensive line, but that won't necessarily be the opposing position group that gives the Giants the most trouble. On that front, I keep coming back to the Giants' Week 5 game at home against the Chargers.
The Giants' main team weakness is their offensive line, specifically the tackles. And they're going to have their hands full with Joey Bosa on one side and Melvin Ingram on the other. That has the potential to be a rough, rough matchup for the Giants.