I have found that being able to focus the beam really helped when working in the dark places that I find myself when doing unconventional work out of "civilization".
Having the ability to sharply concentrate the available light source for intricate/delicate work while still having the ability to then widen the beam for overall scene viewing is a nice benefit. Nothing worse than having simulated tunnel vision due to a narrow beam or vice versa having dim/broad lighting when trying to see with detail and work with precision.
I will let the gear gurus point you to what works best as far as model, etc. Good luck