In my day to day life I generally use the flashlight on my phone. Perfectly adequate for most situations.
In my professional life (policing), I have used a lot of the major brands and seen a tremendous evolution of the technology in recent years. I am not even that much of a flashlight junkie, the way some are. If I am going to fetishize something it would be more likely to be a car, a piece of clothing or a firearm.
Anyway, I've gone from the large and small Maglites (20 years ago) to upgrading significantly to Surefire products around 2005. First, to incandescent bulb Surefires, I think I had an E2E first. Then I got a dual LED / Incandescent bulb Surefire, an Aviator, that blew my mind. Then there was something of a big jump in terms of really high lumen LED products becoming available from other vendors, many of them Chinese, who somewhat left Surefire in the shade in terms of 'bang for buck' for a while... The only caveat being that Surefire was still the daddy of them all for reliability to some extent.
These days I have switched to some of these newer Chinese brands. I have been burned by Fenix in terms of unexplained failures, and I don't like the side-mounted activiation switch on some O-Lights, but I really rate products from Foursevens.
Current light for 'work', a Foursevens MMR-X which is micro-USB rechargeable and throws out such a multiple of the lumens of the clunky old Maglite I started with, at a fraction of the size and weight, it's remarkable. I have backups that take commonly available AA and AAA batteries. I wouldn't bother with anything that uses lithium batteries these days... It's either micro-USB charging, AAA or AA as a fallback, or nothing...