7lazy77,
I have had BOTH the Jayco and the Four Wheel. My aluminum framed Four Wheel Camper was a 1984 Fleet model. My Jayco sportster, which I still have, is a 1994 wood framed camper.
The Four Wheel design hasn't changed. They are still made the same as they were back then.
As others have stated, condition is the most important thing.
That said, I strongly prefer the Jayco to the Four Wheel Camper.
The FWC sagged toward the driver side. All the cabinets and tanks where on the drivers side so the camper was badly out of level. The Jayco is dead level.
I find the wood framed Jayco much warmer in sub-freezing weather.
The windows in the FWC are above and below your eye level when seated. Visibility out of the FWC is poor. This makes for claustrophobic camping in foul weather. The Jayco is much easier to see out of.
The bed cabover on older FWC is too short to accommodate bedding. A sleeping bag or bedding must be removed and stored every time the top gets lowered. The Jayco cab over is tall enough that I leave the sleeping bags on the bed year round. No hassle. No fuss.
In my opinion, the Jayco is a vastly superior camper.
However, I believe that condition is the over riding factor. A nice FWC would be better than a moldy, beat up Jayco.
Good luck. You are welcome to drop me a PM if you have any specific issues or questions.