There is a lot of discussion about flashlights versus headlamps, but it is difficult to search for here. Most of us purchase a headlamp, but then we use it half as a headlamp and half in hand as a flashlight. For you Brits and Aussies, that would be a hand torch.
You can purchase a flashlight but then stick it into an elastic headband, but it is a bit easier to just purchase a headlamp in the first place since it already has some sort of headband with it. On the other hand, many headlamp bands are too heavy, so some of us replace the factory headband with something lighter in weight. Personally, I took an old Croakies neoprene band to my headlamp and saved some weight.
Before you try to purchase a headlamp or a flashlight, you need to establish your priorities. It might mean getting the lowest weight, or the lowest cost, or the brightest light, or something else. You might start by establishing the lumens of light power that you require, like 73 or 100 lumens or whatever. Basically, for camp chores, you only need 25 or 50 at most. For night trail hiking, you might want 50 or more. For spotting wildlife at night, you might want 100 or more. You also want to establish whether you want more of a flood light pattern or a spot/beam. You want to establish your requirement for battery life. For example, you might need it to go 10 hours at 50 lumens, or whatever. You want to establish which battery type you want to use, like 2xAAA, or 1xAA, or 123, primary or rechargeable. Often that decision is made to be like the other electrical devices use so that you can swap batteries or spares as necessary, but it doesn't have to be. Nearly everything needs to be LED, not incandescent.
I've been very happy with my Zebralight. I can click the button to get a low light power and long battery life, or I can click it to get medium power and medium life, or I can click it to get high power and shorter life. That seems to appeal to lots of backpackers, but it costs a few bucks more money. Mine ended up below 2 ounces with strap and battery.