I think it depends on what your goals are. As a lineman and since it sounds like lifting is your main focus, I'd chance that building muscle is your agenda. So, high intensity interval training would likely be your best bet. Also, I'd guess that it would be great for football, what with all those burst of intense energy every time the clock starts back up again (I'm not a fan of the game or anything, lolz). With intervals, you can keep excess fat at bay, without the threat to your muscle mass that endurance exercise poses.
Look it up, find some workout recomendations, see what you think. Often, you can apply the intervals to the cardio activity of your choice. Running, swimming, eliptical, whatever strikes your fancy.