All other things being about equal.... is a person better off buying (for example) 1) a 8 yr old Class B with 60,000 miles or 2) a 12 yr old class B with 30,000 miles
The older unit is going to be much less expensive for all of the reasons listed here. If you are into DIY, I'd buy the older, low mileage vehicle, update tires, hoses, the rest of the stuff that goes bad. Yes, you might have to deal with not having the latest and greatest and you might have to fix stuff, but you have a lot of saved money to handle it. I don't think there is necessarily a "right" answer to this question.