I have used the North Shore racks while riding out west and they are solid. Although I found the rear wheel attachment string a little fiddly for my liking.
I have not used the Yakima hangover but I was looking at one on an SUV at work the other day and it looks to have a good build quality to it like any other Yakima product I have ever owned or used. The foot pedal to lean the rack away from the vehicle for hatch access is also very convenient. There are also lots of Yakima dealers if something was to go awry.
Again, I own neither and have only used the North Shore in a limited capacity. But I own and have owned a pile of Yakima gear of the years and it has never done me wrong.