LEDs should last much longer than HIDs because there are virtually no "loose" parts. HID bulbs have electrodes inside of a vacuum chamber to burn salts, much like a regular bulb has a filament in a vacuum. So, they're susceptible to the same failures from fluctuating voltages, shock (vibrations), and temperatures. Also, HIDs have ballasts (transformers), which have their own set of potential failure points. LEDs as headlights is still a relatively new technology, but it's progressed enough that it's original equipment on some newer vehicles. So, there are viable options for LED headlights, you just have to have quality bulbs and they have to be in a proper housing to use the light effectively. HIDs also require a proper housing. A huge benefit of LEDs is that it's an "instant-on" kind of light. HIDs require a warm-up period before they reach their maximum output. The higher quality HIDs have shorter warm-up times, but you're gonna pay a premium for the better HIDs. If anything, I'd invest in LEDs installed in a properly-focused housing. At the very least, I'd get the best projector style headlights I could find and put quality LEDs in them. If you have a Yukon, you could get by easily with some OEM Denali headlight housings. If a Tahoe/Suburban, you're gonna have to get aftermarket projector housings, which can be found all over eBay. These generally have a crappy output pattern, but you can get high quality projectors from places such as
TRS and swap them into the housings.