At that age, who made it is less important then who maintained it and how well.
I have seen a one year old $250,000 rig that that had been trashed and was maybe worth $10,000
I have also seen a Fleetwood that was 20 years old and looked like it had just left the factory.
2008 F350SD V10 with an 2012 Arctic Fox 29-5E
When someone tells you to buy the same rig they own, listen, they might be right. When they tell you to buy a different rig then they own, really pay attention, they probably know something you don't.