Early 90's Class A --which brand best to buy?

With most motor homes they are built on a couple of standard chassis ( Gm Ford Deere ). The components that go into them are off the shelf from other manufactures. The only issue you may have is finding body parts and lamp assy's. My 25 year old Georgie Boy is built on a P-32 GM chassis. Most of the parts for it can still be found. But things like motor home manufactures add on parts like the fuel tank is a little trickier to deal with. If you are handy, usually these things aren't to much of a problem. One thing to look for is delamination. That can be a real downer. I bought mine in 2000, a year later I noticed the back corner had ants going into it. I freaked out and was pretty upset. I did what I had to do to get rid of the ants, and sprayed a sealer in between the fiber glass and the wood and was able to screw the back corner trim on and sealed that up. That was 14 years ago and today it's still there. The motor home still rolls down the road and gets us to where we want to go. With the maintenance that I stay up with , I would not have a problem taking it across country.