The personal question becomes how much light do you really need, how often do you want to recharge your batteries, and how many batteries do you want to carry.
I hve a 12W HID, and 40W of Halogens.
I need a LOT of light, and I can recharge at will.
LED's have potential, but are really weak. If you need lots of flashes, LED's are your game.
If you want light on the road, HID is your best bet, halogen can do at least as well or better for less money.
LED is good if you want flashes.