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, when it is not in my pocket. The Aux lights make it easy to find in the dark, and it has some of the lowest possible low modes of any light Ive owned.
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