I'm a fan of Surefire. I carry a G2LED on duty (PO) with an E2e as a back up light clipped in my support side rear pocket. The E2e also serves as an off-duty light.
Some salty cops ask me why I carry 2 lights on duty. I was clearing a garage on a possible burglary in the dark when the bulb blew on my Streamlight (my old preference). There is a spare bulb in the tailcap that was useless at that point. The next day I went out and bought a second light.