Jayco is owned by Thor. Grand Design is owned by Winnebago. We have a Grand Design Reflection 5th Wheel so I can't speak about Jayco other than to say we narrowed things down to the same two brands When we bought our Grand Design. For us, what tipped the scale was which dealership was selling what and their reputation overall (Both Sales and Service), and which was going to give us the best deal. In our area it was Camping World that sold Jayco's and a smaller dealership, Meyers RV that sold Grand Designs that have 7 stores within a few hours of where we live. We chose to buy the Grand Design because we got the best deal on it. The other things were pretty much a wash.