When I was looking at Popups, I visited both the Hallmark factory as well as a large NS dealer in Colorado. I felt both make really nice campers but Hallmark is more on the line of a custom pop up where NS makes a lot more campers. I think that is the reason Hallmark is much more expensive. They market themselves that way and you can definitely tell the difference when inspecting both.
I ended up at the end of my research and buying journey purchasing a hard side. Today, if I were to get a pop up I would lean seriously toward a 4 Wheel Camper. My plan would be to leave it on my truck full time and they are really designed to do this. Nothing against Hallmark and North Star at all, I just really like the 4 Wheel Camper.