My current Favorite pocket flashlight is this one:
EagTac EagleTac TX25C2 | illuminationGear | illumination Gear
I've had it a couple of years and love it. To make it float, you cut a 6" section of pool noodle and push the tail of the light into the hole in the noodle. That's a good way to not lose an expensive light in the drink. The pool noodle trick works better with a back clicky switch, but still works well on a side switch.
All my lights, car, pocket, headlight, etc., are all 18650 battery powered so I keep a few spare batteries charged for an easy switch. Plus my charger runs off AC or 12vdc and charges two batteries at once.
I have gotten rid of any flashlight that is not regulated since an unregulated light is an inefficient one, bright at the start, darker as the battery is consumed. A regulated light is constant until there is no power left to drive the LED.
If you want a flashlight that will be there in time of need for your ditch bag, carry a few CR123 batteries since they have a zero self-discharge rate design with high power output at a wide temperature range. That way they will be there
I hear the new Tesla 2170 batteries are slightly larger and have 40% more capacity and the flashlight market is adding support for them now. I'm waiting to see how those do...