Very good demonstration/explanation! H/T Wirecutter on this series.
From the comments below the video: “The functional difference between the two types of triggers is that a single-stage is fine for if you want to build an AR from parts on the cheap or just don’t plan on long-range shooting, while a two-stage trigger is good for long-range shooting because the pull is lighter and there’s more pre-engagement in the trigger (meaning you can pull the trigger down to the break without actually releasing the hammer, which has advantages for keeping the rifle steady and only engaging it right when you’re ready – a good comparison is running up to a wall, observing, and then vaulting, as opposed to just hauling nuts over the wall at 100% speed from start to finish). A single-stage is heavier so it takes more sudden force to release the hammer, which can shake the rifle in a way just dramatic enough to throw off a shot by a few inches at several hundred yards.”
My own experience, being weaned on 2 triggers., using the M-16 and M-14 on active duty: The longer you use the 2 stage, the more you might find you like it and the more your trigger finger will be ‘educated’.