We have a Motorhome. We're on our second. Owned Motorhomes since 2010. We got the current van in early 2017. We worked out we've had 2 years worth of trips in it. We go to Scotland, Wales, France, Italy, Spain, Portugal and Germany.
As a child I used to go caravanning. We'd stay UK (mix of tiny CLs to big commercial sites) and France, Italy, Germany and Netherlands. We'd be away every Bank Hol and school holidays excluding Xmas.
So with my experience I think I'm well qualified to speak about both types of hol - they are totally different!
A caravan is about going to a site. Obviously you can 'tour' to get there. A Motorhome is about the journey not the destination.
In the MH we never spend more than a few nights in one spot. We NEVER stay on campsites (a MH kitted out correctly eg solar panel means you are self sufficient). We wild camp - there are apps, but a certain amount of common sense is also required to find spots. Scotland and abroad (France etc) are fab for MH'ing. You'll find a network of free to use aires/ stelplatz/ sosta (depending on the country). These are specifically set aside for MHs to park overnight and sleep in van. Often there'll be a toilet disposal point, grey waste dump and fresh water to top the tanks. Generally these are all free. They'll often have restrictions on not being able to stay more than 48hours.
Our MH is just over 3m heigh and just over 7m long. It's big. Not huge. DP used to drive commercial vans (7.5 tonne) as a delivery driver. He's an absolute wiz driving it. We've stopped in big cities, narrow streets, mountain passes, country lanes etc. It's got a stonking big engine (2.3 turbo) so no issues handling steep gradients. It has a hill start button for wet/ steep roads. Having spent large amounts of time travelling in it in France etc. I've noticed they are meccas for MH's which is hardly surprising given the facilities!
The 'packing' stuff up ready to move on isn't an issue (like it was with the caravan). Everything is designed so you put item back and batten it down. The only thing that does require putting away is the over cab bed. We have a large double fixed bed at the back. Much more comfortable!
We are a very outdoorsy family. We cycle, walk and kayak as well as enjoying site seeing. So the MH is perfect for us. We have a large garage it contains all the bikes, a kayak and goodness knows how many toys and outdoor games, deckchairs etc.
If you like to be settled, I wouldn't bother with the huge expense of a MH. If you like a driving holiday and life on the road (and won't be shit scared of driving one) a MH is the way forward. It's worth chatting with other owners with similar circumstances to you. There are so many different configurations available! As with a caravan. You want one that suits the needs of your family. For us a garage was a must have, as was a fixed bed.