As a pop up and past hard side and Class C owner I'll offer the following which mostly are based on my meandering experiences, thus IMO:
-I use less fuel hauling my pop up camper than I did with my old hard side and certainly my motor home.
-My pop takes more heater effort to keep warm than the other two. Actually it warms up fine it just cools quicker. In fairness I do not have an Arctic Pak for the soft side.
-Hauling my pop up down a two track road or no road is much easier, period.
-Inside storage was better in both the hard side and motor home.
-Dropping and using my pop up like a base camp trailer takes some effort as the floor is not built to use without support. My hard side could be used on the jacks alone though I always put it on the ground.
-As for toilet/shower my pop up is old and has neither. I've got work arounds and don't really miss indoor plumbing. My hard side had toilet/wet bath and MH toilet/dry bath. I did not care for the wet bath so rarely used it. Got the most use out of those amenities using those vehicles like hotel rooms at baseball tourney's, the county fair circuit, Mt. Rushmore and the like. I will suggest, IMO, if you plan to camp with the fairer sex and they are #1 not accustomed to dry camping and/or #2 your use may take you to sketchy camp grounds with poor facilities the bath shower equation becomes more important, really important.
Happly Holidays and best of luck....