I have a variety of flashlights, because there isn’t just one tool for the various jobs where I need a flashlight.
For general flashlight use, where I just want to temporarily put some light on something, I use a AA MagLite. I have a couple of original ones, upgraded to LED bulbs and tail cap switches. Fits easily in a pocket, easy to use, bright enough to light up whatever I point it at. I also have one of their AA LED lights, and it’s ok, but not great.
Because I normally work alone, I have a modified microphone stand with a home built holder for AA sized MagLites. This allows pointing it at something, and letting the stand hold it. Works better than a small child that would rather be elsewhere, even if I had a small child available.
I have a Petzl Pixa 3 headlamp, for when I want hands free light on whatever I’m looking at.
Unlike the current trends to extremely high output (claimed or real), this has a useful level of flood light in close quarters, as well as higher output spot light. And no stupid blinking mode. With a side switch knob I can work even with gloves on. This one has a band, so works with almost anything, but also can be hard hat mounted with a different clip.
I have a couple of the HF folding flat stick lights.
Lots of light, easy to stick to something, good strong magnet. I like these a lot, and they get a lot of use. Adding a piece of 1/8” flat steel to the bottom works well as a “stand” when working around something that isn’t magnetic.
I don’t know the brand, something inexpensive from Farm & Fleet, but it’s about 3” long, with the light on a right angle. Not this one, but essentially the same design.
I threw the strap away, and used some 3M mounting tape to stick the bracket to the chin of my welding helmet. It helps put some light on the welding area.
I have a bunch of other lights, ranging from tiny (single AAA MagLite) and kinda useless, to cheap LED lights that were free and are ok but not great, to bigger things like the 2D, 3D, and 5D MagLites with LED and 18650 upgrades. These don’t get as much use as they’re smaller brethren, unless there is some reason to use them where size, weight, or light output outweighs small size convenience.
All of my lights use easily replaced batteries, so battery life isn’t a great concern. I keep a bunch of spares charged and ready to swap in as needed.