Propane burns cleaner, but isn’t as powerful as gas. More importantly for me camping, it isn’t nearly as accessible. I purchased a dual fuel Westinghouse i4500 a little over a year ago. I’ve used it between 50-100hrs so far, at altitudes up to 9400ft. I’ve only used gas (frankly , would have bought gas only unit for $100 less if I could have found one when I needed it). I get about 1/2hr per gallon of gas running heavy loads. Finding LP and hauling tanks would be much more difficult for me than carrying a couple 2.5gal Jerry cans.