I have been on two Dall hunts. One in AK and one in NWT.
AK Pros: Price, availability, options. Cons: Competition, no defined guiding areas, over harvest in some areas, weather delays.
AK sheep hunts are better priced but in many areas the harvest is too high. I hunted for 14 days. We were in rams every day and found a total of one legal ram. Weather delays for flying and for glassing were significant. AK gets the storms first and they are more frequent than in YK or NWT. We saw other hunters, both guided and DIY guys while in AK. Don't get me wrong, you can have a great hunt in AK. A lot of people do. It is a great place to hunt.
NWT Pros: No competition. Zero, zilch, nada, nothing. You will never see another person hunting. Harvest is far more controlled. You will see many legal rams. Defined guiding areas so no outfitter competition. It is hard to find a negative review of any of the outfitters in NWT. Weather is typically better in the rain shadow. Cons: Price is higher. Travel costs are typically more. Long waiting period.
The long waiting period can be a good thing. It gives you time to save up the money. I booked three years in advance with Stan Stevens. A third at booking, a third at the start of the year you will hunt and a third the day you show up. I would suggest you contact the outfitters for prices rather than get prices from past hunters. The hunts are booked so far in advance and change from year to year. But I bet you can get a pretty close estimation on your own. When I go back it will absolutely be with Stan. It was a fantastic hunt and it was everything he said it would be. I am sure you could find the same thing in AK or the YK as well. It's expensive no matter where you go, so once you find a great hunt you might as well stick with it.