Who would you say is the biggest rival for each team?

Pretty good except for a few of them. You cant really call inter conference games rivalries, they only play every four years. Thats why I would say the Giants main rival is the Eagles, but you could argue for the Cowboys. Same for the Texans, they've only played the Cowboys 3 times, their rival would probably be the Colts. The Patriots would be the Colts based on recent history.