I rode both roads last June and the folks were great on either side of the boarder. Dawson city is really fun but the road to Innuvik was in worse shape at the time, than the Dalton. 6 inches deep of marbel size, loose gravel at some points for miles. The weather was alot better in Inuvic though..really hot and sunny. I think that may have been unusual but it rained everyday in Deadhorse. Innuvik is an interesting town and there is stuff to do and camping is pretty cheap.
There was not much to see at Prudo Bay unless you shelled out the 35$ to go on the bus tour. You do get a chance to go swimming in the artic ocean though. That was the seller for a couple of folks on the trip. The hotels are very expensive. Of course you can just camp outside town.
They are both gorgeous but where ever you decide, bring the bug dope.
Hope that helped.