Weighing in on the better/brighter question HID vs. LED for your Denali
-HID's in projection low beam housings are going to have better distance *********** than LED bulbs in a projection or halogen housing unless it's a spot projector and you wont want that for low beam on-road. LED bulbs will last longer but not recommended over HID in your case.
-I think you'd be most satisfied with HID's in projectors as they'll ********* further down the road in general over in-housing LED bulbs. Stick around 4300k for most usable light.
-If you still want more, build yourself a combo setup with aux LED flood's and spots. I'm using simple combo floods/spots in a Tahoe and Yukon build both with projected 55w Low, 55w Hi/Fog and 300w or less bars. Light output is insane yet I don't blind oncoming traffic (using low beam). I've yet to photo drivers vantage point but here's a headshot.