Malkoff M61T, or any of the MD2 M61 series. M61 Hot is very popular.reliability/durability and customer service for each brand.
Malkoff has a 21700 body, too, if that's what you prefer.
You will not get more reliability or durability, and will not find better customer service. They are made in ‘Merica to take recoil and abuse.
Here's an option that is a tank of light: https://skylumen.com/collections/v54-lights/products/sky-lumen-nguyen-serial-61-100
You might want larger, but if you want the toughest least likely to fail then PEAK LED in stainless steel is where it's at. It's bulletproof and will last forever.
Logan 17500 is very nice and versatile with battery options. Momentary switch plus a pocket clip from Oveready. Bombproof forever light.
The import lights get super bright and have all these options, switches, colors, shapes, tactical words….they aren’t for me.
I’m told the hotter the LED gets the shorter life it’ll have…so take that into consideration when looking at those import lights.