That handheld DeWalt light is pretty good. I had one at work that i gave away.
You should consider exactly what you want to use this for. Hand held lights are great - until you want to put them down and use two hands. Also - do u really want a spot light (distance) or do want to be able to use this as a work light too (flood light)..
The Milwaukee search light version has a few advantages. It has both a spot and flood options that you can toggle between OR use together. You essentially get two lights in one. Better still is the base and head. The head swivels up and down, and you can lay the light down flat on it's bottom, or pointed up on its battery as a stand, and rotate the lights head wherever you need. It's extremely stable. Also has a screw slot to hang it on a wall for storage. The Milwaukee is a much more robust and useful light over the DeWalt version, but side by side the spot light itself is slightly brighter over the Milwaukee. Nothing life changing, but it's a little bit brighter.
IMO - the versatility and overall quality of the M18 Milwaukee far outweighs the Dewalt's slightly brighter spot beam. If you want something smaller, and handheld - then consider the Milwaukee m12 version. I have that one also. It's highly impressive. Never did a side by side with that one, but it's a dedicated spot light with adjustable brightness. Smaller in size than the DeWalt, but doesn't have a rotating head. Build quality still better than Dewalt's IMO.
Lastly - these aren't light cannons just to make peoples jaws drop by turning them on, but will be dead 3 months later when something overheats and burns up. All these 50,000 Hour LEDs in the advertising you see for lightbulbs is ********. Something in the electronics will always burn up. (How else do they make u buy more?). But these tool branded lights are TOOLS. they will work when you need them, they won't brake if you drop them, and they will last. People rely on these for jobsites, emergencies, and to make money. These companies deliver the ability to do that.
That DeWalt led light stand posted above is rated at 3000 lumens, not 6000. (Unless that's a new model)