I'll take the OL, because it will help both my offense and my defense if used properly. How, you ask? Well, the offensive benefits are obvious (keep the QB upright, open holes for the RB, sustain drives, etc.), and the defensive benefits become apparent when you consider running a ball control offense. The longer your offense has the ball, the less time and therefore less oppurtunities the opposing offense has to make plays. If your offense has the ball for 10 extra minutes, your defense only has to stop the opposing offense for 20 minutes of game time, which would basically cut about 2-3 possessions out of the opposing team's offensive oppurtunities, thereby benefitting your defense.
The problem arises when people use statistics like a drunk uses a lamp post: for support instead of illumination.
If luck is where preparation meets opportunity, then clutch is where failure meets luck.
<Add1ct> setting myself on fire can't be that hard
<Add1ct> but tackling a mosquito might prove a challenge