Motorhome = long days traveling, 2 get to enjoy the view, as driver and other front seat driver are keeping their eyes on the road, tired drivers, expensive gas, peanut butter sandwiches, smelly feet, tired card games, arguments galore.
airplane = faster safer trip, everyone can sleep (or enjoy the view),can take a partial cruise ship too, everyone too excited to argue, faster safer trip home
I'd go with the plane ride...