If you are going to be taking different vehicles with you when you go camping, then the dolly would probably be the way to go. Depending upon the year and transmission, your Ford Edge may be 4-down towable, which is the easiest way to tow. As you can see in my signature, we tow a 2016 Edge Sport AWD 4-down. Used to tow a front-wheel drive cat on a dolly, but no longer.
With a dolly, you can tow almost any front-wheel drive vehicle. You will not be able to tow AWD or 4WD vehicles on a dolly without modifications. Some front-wheel drive cars will bottom out when you try to load them on the dolly, so you might need some boards to ramp your way up with those cars.