The Utorch has an aspheric lens. It is completely floody, with no hotspot. I love it for close range.
The M3 has a reflector and flat lens. The beam has a hotspot. It is not good for flooding close range, its purpose is to shine a small hot spot on things farther away.
So, I would say do not buy the Utorch for outdoor use past about 10 feet, and do not buy the M3 for indoor use at close distance.
the beams are Completely different. If you have never tried an aspheric, the Utorch is the least expensive way to find out if you like a full flood close range beam. I Love it, because I use the light inside my house, and inside my car, and inside my camper. If I try to use it outdoors, I only expect it to illuminate my footsteps, nothing more than 10 feet away.
most reviewers Hate the aspheric lens, maybe because they are into Max Lumens, and Max throw. The M3 is a better choice for them.
I dont use max lumens, I never use Turbo on the Utorch. All my use is at the low end of the output range. I love my aspheric experience so much, that I have bought a total of 3 Utorch S1 Mini. I even sold my Olight S Mini and Olight S1 Mini, because for me, the Utorch beam is So Much Better!
it all depends on what you want to use the light for. you can read more of my utorch opinions here, where I compare it to an Olight (which for me sucks at close range indoors as the beam is too narrow for what I do)