I would go for the bus every time as a laundry nook is a winner to me. Plus, just to see he look on my Alaska friend's faces when I drove up in such a rig, would be priceless. :)
With some degree of seriousness, I would take the one that the driver or both drivers are the most comfortable driving. My wife would and has driven our Class C rigs in the past, but I can't imagine her even attempting to drive a bus home, if something happened to me. Over the 51 years I have been driving the Alaska Hwy, the vehicle I was driving made very little difference to the pleasure I received from the trip. The roads are fine for the bus, since I would think you would take a toad with you. If you already have both rigs, it would be a coin toss for me, but the bus would probably win.