I'd be tempted to take the Giants too but think about it. The Giants were a low scoring offense with Jones playing healthy. We have to expect the Cowboys offense is going to score in the 20s at home so the question is, can the Giants score on Dallas's defense with a 3rd string QB no one has ever heard of?
I expect the Giants to run the football as much as possible and try to keep the football from the Cowboys. Look for a lot of short passes and Barkley runs. I believe they will have both of their starting OTs back for this game too.
The only way this game is close is if the Cowboys do not take the Giants seriously, like they did with the Cardinals.