Wow, this thread got WAY off topic, eh?
I was blessed to draw an AZ tag this year after 10-years of applying (or was it 9 plus the loyalty? whatever).
Although I had a great hunt, and was blessed with a good bull, I found my hunt in AZ to be very similar to my hunting home in NM: every road was crawling with trucks or sidebysides.
I would lean toward whichever unit you can identify inaccessible parcels to get off the beaten path. In the unit I drew there were very few places without roads, and although I found elk pretty much every place I looked, it was in the more remote areas in which I found less hunting pressure and had a more enjoyable experience.
Now settle down and play nice...
Carl