Well, I voted for headlamp, so how is this really useful for me,
but in fact it is better to have both.
I have about 1.2 million people in the city, I would not say that this is a remote area,
the CR2 batteries can only be bought in several large stores and it costs here
more than CR123, while AAA/AA is everywhere. 1*CR2 = 1.4*CR123 = 9*AAA = 13*AA.
Of course, this situation is only in my region, others can be different.
Alkaline batteries do sometimes spill, but if you make the compartment
sealed from the switch and head and contact parts, resistant to corrosion,
so that in the event of a leak, you can simply insert a new battery?