As others have mentioned, motorhomes generally are easier to set up, but then you have to deal with driving a large vehicle everywhere or towing a car for day trips. Driving a large motorhome through the narrow roads of state and national parks can be quite a challenge, and there are many park roads off limits to RVs since they are simply too narrow or have height restrictions. Towing a car behind a motorhome negates the setup advantages over a travel trailer in my opinion since the car will have to be detached every time you pull into camp, and if you get into a situation where you have to back up or turn around, you have to hassle with unhooking the car first.
I really like the floor plan of your trailer, but it is pretty sizable, so getting comparable space in a motorhome is going to have you looking at something like a Class A in the 35+ foot range, which won't be cheap or easy to drive and park in national park campgrounds.
I'd take some of the advice offered and rent a motorhome for a trip or two to see what you think before taking the plunge and then risk being disappointed with a big hole in your wallet.
Good luck!