The White TS10 on the left uses 14500 LiIon, it has a tailswitch that I find easy to use, and a floody beam. it sits on my desk.
The Green SC21 Pro has an illuminated button and a tailmagnet, it sits on top of my fridge in case there is a power outage. Or, because it has built in USB-C charging for 16340. I can pair it w my 16340 HDS when I travel.
The Orange H150 is dual fuel AA/14500 with built in USB charging for LiIon. It has an efficient regulated driver w no PWM. It is in my car emergency kit, with its headband and spare Lithium Primaries and Eneloop…
The White D2 runs on 14500, and has a white and a red LED. It also fits the headband of the H150, and the F12 flat top I use in the D2, can be charged in the H150. It has an efficient regulated driver w no PWM. It is in my pocket
Well, technically linears are still regulated ;), the only truly unregulated driver in common use is a FET-only driver. Linears are just not consistently regulated to a flat output until the battery is almost empty. But yeah, the D2 has a linear driver.
I also have a green fridge-top torch, SP10 Pro with diffuser. So I can put it on sunset mode and exit my kitchen with both hands firmly holding a tray of food, rather than one grabbing for a light switch!