I have several and greatly prefer the Photon Freedom for it's many easy to use functions. It has one of the best UI ever conceived. It can act as a standard "press for constant on, press for off" light, but if you hold the button down it will come on low & ramp up to what level you want. You can also ramp it down after turning it on high by simply pressing & holding it after a short press to turn it on. I use the low more than high, and so the batteries last several years even using high every once in a while. The option to have and use low makes it so much better than single level coin cell lights. And you can put it in momentary mode as well as access well out of the way blinking modes.
The X-light has the same UI, and is just as good except that it costs less, is a little bigger, and clicks audibly turning it on & off. I personally prefer the silent press of the Freedom.
Freedom is the answer!