In reality the difference is as good as the combination of the limits of the unit and the accuracy of the user.
Most 'users' prefer some sort of indicating wrench that signals it is at the right setting as it still works out of position, at night or when you can't see the scale or are in a situation where you are looking for movement of everything else rather than the wrench (like trying to tighten up scope rings without the scope pissing off out of level). You as the user really define the accuracy of the torque you achieve on the screw, and things like cleaning and lubrication of the threads, amount of downward pressure and rate of turning of the wrench, angle off, driver type and size, stretch in the screws and parts all combine to create error. For the average firearms application actual torque is less important that achieving the same torque every time within a suitable range (start the argument now haha).
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