Everyone has different needs, but having owned pretty much every type of RV available, I'd say a truck with a fifth-wheel is much easier to mange than a coach with a flat-tow car.
A fifth-wheel is easy to backup when needed. A coach with a flat-tow car attached can't back up at all.
And as long as you have enough truck for the size fifth-wheel you have they tow much better in wind and handle curvy roads well.
While it's true that you can't back up with a towed vehicle, the advantage of the RV is that you don't have to -- only takes a few minutes to pull the pins and free the car and generally when I'm towing the car, I want to use it, so I'm going to unhook it anyway when I park, may as well unhook it before I back in the space (especially since I typically want to back in all the way and put the car in front)
But as you say, different use cases for different people - if you already have or want a truck (or other tow vehicle), a towed RV makes a lot more sense. But I don't want a daily driver that's large enough to be a tow vehicle and it makes no sense to buy a tow vehicle that's only used for towing.
A fifth-wheel is easy to backup when needed. A coach with a flat-tow car attached can't back up at all.
And as long as you have enough truck for the size fifth-wheel you have they tow much better in wind and handle curvy roads well.