I'm with those who say that the sling should be suited to the job. For example, when I was selecting a sling for this tour, I ruled out three-point right away due to previous problems with hanging up on gear. I chose not to have a one point because I would need both hands for other tasks, and if I drop the weapon I don't want the muzzle going into the ground, into my knee, or inhibiting access to my sidearm.
I went with a two-point sling, padded, with quick adjust and quick release. It's nice to be able to cinch it down while navigating rough terrain on foot, or riding in a vehicle or helicopter. I wanted the quick release in case either of the last two has a crash. Particularly with the MRAP, if it gets blown up or collides with a solid object and starts on fire, I don't want my sling being the obstacle that prevents me from getting out because it's hung up.
Having said all that, I'm a believer that the rifle belongs in the hands of the shooter when afield. The sling should not be the primary means of carrying it - the hands should. The sling is there to retain the rifle in a ready position when the hands are needed for other tasks. Since sling selection is based on task at hand, what I'm using here won't be what goes on my hunting rifle when I get home, and my HD shotgun doesn't even have a sling or strap on it: If I need that one, it's got to be in hand.
