All units you'll be able to hunt for 3-5 years in a row will have a high level of hunters, enough public land that you'll never be able to cover it all, good roads and bad, high elevations, and steep rugged country. No escaping those facts.
There are members here that could go into any OTC unit for the first time, find elk, and have a good chance at killing one. It has little to do with the unit and statistics, and everything to do with first hand experience in elk country. Only one way to obtain that. Throw numbers in a hat and pick a unit, there's no magic formula.