plays typically cover more yards. However, if you look back throughout the years the team that rushes for more yards in a game usually is the winner. It appears that if you have an offensive mix, yes you will get more yards passing than rushing in your own offense. However the team that rushes for more yards will more often win the game. That said, these days the QB rushing game has become such an integral part of key plays that the stats can be skewed. The one great exception is Navy who will generally out rush every team they play win or lose.
A play mix to me is the best offensive system and to be an undefeated team, you have to pass and run well. The rare exception to this general rule is when the QB is such an effective runner that he can beat a team by having a dominating game on his own. Mahones and the kid from the Ravens are doing it at a pro level and so is Watson to an extent. Their effectiveness with their feet makes it incredibly difficult for defenses to stop them for the whole game because defenses can cover the pass for only so long and it opens up big play potential. It appears running strong teams field more consistent teams while passing teams can more likely spring upsets.