back in the days when I used Halogens in this size/output-class, I used my 9N nearly daily.
At some time I also thought I need to have a turbohead.
1st of all it adds so much to the diameter/size of the light, it is awful to pocket.
when in open field, the reach is more or less identical (means if some object can be spottet with one of the lights, it works the same with the other one, too) but the turbo makes a brighter dot of light at that "end-of-view"-distance.
not really important compared to the added size.
but there is ONE use where the difference is very obvious, thats
forest/wood.
Imagine You are standing at a road inside a forest, brush around.
the normal head illuminates everything around You (has effect on the night adapted eyes, they switch brightness setting down) and does not go very far on that road.
The turbo on the contrary does not give too much sidespill (eyes stay wide open), the brush gets a glim, but somewhere
there, at the very end of the view along that road, there is the light dot.
At these circumstances the turbo shines (but the normal head is best in every other field)