
The only 2 disadvantages I found with a motorhome as opposed to a towed caravan is that 1) you have to pack everything up when you need to pop to the nearest town for supplies which can be a bit annoying and 2) if it is a fairly large van you can be limited as to where you can park it around town etc but other than that I loved our motorhome. It tended to get more use than our caravan as we would use it for days out where it was really useful to make a cup of tea, cook a snack or just be there to have some relaxation.
I suppose another disadvantage with the motorhome is that you have to tax it and have it serviced etc as you would for any vehicle so the running costs are higher. I personally wouldn't go for a huge van again as it does limit where you can go in it - little tiny villages in Spain are out as are some of the very narrow country lanes.