having both, I prefer the front night sight only. second to that would be a different colored rear night sight which I have too. In darkness, I pick up the front night sight (with no rears) much better and faster than if I'm trying to sight three glowing dots. for whatever reason, the two rear dots in darkness messes with me finding the front and adds significant time, even though they are slightly different colors. For me, finding the front sight in a plain rear notch is where its at and what I prefer. YMMV.
God Bless Our Troops.