Regardless how much the original owner used it for camping, it's still exposed to the elements. Sun can deteriorate tires (dry rot them), and hail, snow, a shovel used on the roof, can cause roof damage, regardless if it ever moved or not.
Both brands (when they were brand new), were pretty good and pretty comparable. 7 years later, it all depends upon how the original owner took care of them.
Word of caution ... no matter how honest and upfront the original owner is, you CANNOT believe a word they tell you. They will tell you anything to off load it, especially if its a trailer that they've had problems with. YOU need to inspect it, top to bottom, inside to outside, front to back. Poke, jump, jab, swing, lift, open, climb, dig, pull, push absolutely everything! Any soft spots in the ceiling, roof, walls, floors ... RUN! It's more than likely had water damage, and that will be a nightmare for you. Inspect it yourself, get knowledgeable. Go to a dealership and look at the new models. And although sales dealers lie through their teeth too, they WILL give you an education on what is good and what is not. Then walk away and don't buy. Visit the next dealership, ask questions, stupid or intelligent, doesn't matter, see what the salesmen say. Talk to the service reps too. Educate yourself. Then when you look at your potential purchase, you'll have a MUCH better eye for picking out any problems. If the camper has problems, no matter how much you may like it, don't be afraid to walk. There is Always another trailer out there.