Jagatud heli

Say you go to bed at night and someone says, hey, you will wake up tomorrow and you will have diff lock or all wheel drive, but you can choose one. So which one would you choose? Guys, I'm using the GMC MH9500 for this test. And the rules are you cannot use automatic. It's just high, medium, low. And please remember that this is specific to this vehicle. This does not pertain to every other truck. And I say that because this is a highway vehicle. And it's the only highway vehicle