I'd say Li primaries although NiMH don't have as much voltage sag and if you check them monthly, they should be ready.
I have a multipurpose COB & reflector light w/magnet that uses 3*AA, a budget rechargeable headlamp (Boruit?) with an 18650 and a Nebo Blast with 6*AA. AAs are Li primaries.
List:
The Nebo is a blast with 1400 lm on primaries. Variable beam depending on situation.