After 30 years of hardsides my last 2 TC's have been pop ups. My biggest complaint for hardsides is the small windows and very limited ventilation.
I bought my first pop up in 2010, an 88 Northstar for my '10 F 150. Went snowmobiling one weekend at 25 below zero. It was very comfy in the camper but I did line the canvas in the cabover with Reflectex.
Then I bought my '11 F 250 and modded it for off road. I literally beat he Northstar to pieces. I replaced it with my present TC, a used '07 Sun Lite. It is much heavier having a bathroom and waste tanks. As heavy as a comparable sized hardside. Even at that it has held up very well over the rough stuff. And even with the reduced height I still managed to tear off the blank tank vent on the Lolo Trail.
As mentioned before the large screened windows are a plus on a warm summer evening. BUT last February while camped in Death Valley there were very high winds for two nights. High winds can damage a pop up with the top up. If the canvas doesn't rip loose it can bend the mechanism where the top will not realign when you put it down. So I spent two nights jammed in beside the dinette with the top down, much like a coffin. So there are trade offs either way.