I'll be rooting for Philadelphia.
Basically, there is no margin for error anymore wrt the Giants, and looking at the rest of their schedule (Philadelphia, @Washington, Carolina, @Min), they have a very good chance to win one more game than the Cowboys.
It looks like Minnesota will be the second seed, and unless New Orleans loses before week 17, there won't be much incentive for the Vikings to lay it all on the line in the regular season finale. The Giants, OTOH, are likely to be playing for their playoff lives.
You can look at Philly's schedule, too, but Dallas doesn't necessarily have to keep pace with Philly. It is possible that Philly could go 3-0 over the next 3 while Dallas goes 1-2 or 0-3, but if that happens, it doesn't really matter who wins Sunday night.