Find an independent rv repair shop and ask the mechanics who repair them.
Pick a floorplan that will work for you and a reputable dealer that will be there for you, after the sale.
After i bought a very popular brand that people said was very well built, i realized why the customer service was so good. They acquired a lot of experience fixing things that should been built better in the first place.
After having the pleasure of taking it apart numerous times to make repairs myself, i realized how poor and sloppy it was built. Therefore i question the opinions of what's best. Most owners don't take their rv's apart themselves to really know and you'll end paying 2-3x as much for it.
Go to the owners forums of various brands and you can read the good,bad and ugly on ALL the brands.