I haven't used every light in the world but the LED Lenser H7R is by far the best light I have ever used.
The slide on the back adjust intensity and there is a slide on the bottom front that adjust the size of the beam then a button that simply turns if off and on.....I hate the lights where the on/off button also toggles through 5 different settings before turning off/on.
It is basically right on par with my nite lite coon hunters favorite except it runs on 3 triple A batteries instead of the huge battery pack on your belt.
It recharges but will also take non rechargeable triple As.