So, for an actual AA light, I like my Coast HL27. Looks like it’s discontinued, but it’s been reliable for me for a long time. I really like the rheostat for dimming the light and ability to adjust the beam pattern to match my needs. The HL7 looks like the successor.
Why do I bother with AA? Simple, I wind up with a lot of batteries from trail cams that are partially used. Letting them soak for long periods means they always get a fresh set, but there’s often a bunch of partially used ones.
The AA headlamp lets me use em up on low-risk efforts. I’m not at a lack of lumens for the vast majority of things, and the darn thing won’t die. A fresh set of lithium AA batteries will last me a week long elk hunt, but your mileage may vary.
I do own an 18650 light and I like it. If I were buying new and didn’t have a ready supply of AA batteries to use up, I’d go that route and look for adjustable beam pattern and variable brightness.