Almost half the original value depreciates in the first five to eight years, so the older you buy the closer you get to value depends on condition only.
Pathfinders were base level models for rental markets. Mirada is an entry level coach for the consumer market. Choices of materials, fixtures, finishes are all in the direction of minimizing construction cost for low price point. While there were Beavers at different price points, mostly tied to chassis capacity, there never was a Beaver built down to entry level represented by the particular gassers you are looking at.
If I wanted something as big and powerful as the Beaver, I would pick the older Beaver over any entry level gasser on a chassis with 1/2 to 2/3 the capacity. Whether Beaver was building them, or it was Monoco Corp after they acquired the Beaver brand, all are heads and tails above Coachmen entry level gassers.
But of course, it also depends on condition. If the Beaver is now a wreck, differences in initial quality don't matter until you figure out the additional cost of repairing the wreck.