Someone will come along and say that the military wanted the longer two stage pull to prevent accidental discharges with raw recruits. That might have been the original intent back in the day when the Springfield 03, 03A3, Garand, etc. were the issue weapons.
For us civilians and modern day competition shooters, and especially when applied to AR type rifles, most feel the two stage trigger has a slight edge for distance shooting. For reliable ignition, especially if shooting military surplus ammo with a harder primer cup, the two stage can be made lighter and still be 100% reliable with all types of ammo. A final pull of 2 or 3 pounds with a two stage is not uncommon. A single stage trigger should remain at 4 pounds or above for reliability.
The initial movement of the two stage is referred to as "take up" rather than creep, but it is travel all the same. I dislike a long movement of the trigger and like my AR triggers to be the same as my 1911's, lever and bolt actions. A good single stage with very minimal creep or overtravel will feel really good at 4 or even 5 pounds, and I can do well with it.
It all depends on what an individual likes and what they feel they do best with.