deciding between thor quantum pd31 and leprechaun ds317

Don't know much about the Thor, but my wife and I purchased a 2015 Leprechaun 317SA last year. It's been a great coach and virtually no problems. We've had 3 class Cs over the years and this is our best start for a new purchase. Our other coaches were a 99 Fleetwood Tioga and an 88 Mobile Traveler. All coaches were on a Ford chassis and in all cases the Ford reliability and performance was excellent other than gas mileage, which in your case, expect about 8 mpg or so. Good luck with your decision!