I have run HIDs for a fair while now and with the led lights coming in i have observed this. Its really a horses for courses kind of argument. Same as you are not gona use a cutting horse to win the kentucky derby each type of light has its own benefit. LED Bars or lights will not get the penetration and distance down the road that a hid will (my 70w KC PODS will light up a road side cow well over a km away). But HID will not give you the close range fill and spread and "Day like" light quality. So based on that i would say for desert where there is little for light to reflect off of and your vision is probably only needed out to 100-200 feet LED lights and bars are probably the better choice. If you are puting lights on your tow rig or something and want to see those road side cows or deer well in advance i would say get yourself some good quality high Wattage HID lights. Or even on your trail wheelin rig id say it would be a 50 50 split decision on lighting.
All that being said there is another option. In Australia on our winch challange trucks the top guys run 24 volt to the winches. So another popular thing to mount on is 24 volt air craft landing lights and wire it to the 24 volt system. They ** ĦAy, caramba!**** ĦAy, caramba!**** ĦAy, caramba!**** ĦAy, caramba!**e on hids in my opinion!!!! Food for thought.