Gas vs diesels

I believe the decision rests with how you intend to use your rig. If you are a week-ender or a once a year vacationer then the gas rig is absolutely all you will ever need. If you are a serious traveler putting on many thousands of miles per year you might consider a diesel. Will a gas rig do either job? Absolutely! Will it outlast you? Most likely. But as previously mentioned there are other considerations- ride comfort, power, noise levels, towing ability etc. As far as costs are concerned- original purchase cost of a diesel will be higher- but so will trade in allowances later. Operational costs? Tough call...
A whole bunch of this decision will be personal preference.