What you pay for with the CH is the one piece fiberglass shell that encompasses everything. This gives it as much leak-resistance as you can find in an RV.
However, this advantage might not as large these days, because with a Rhino lining or Dave's Permanent Coatings epoxy sprayed roof, there will be no seams, gaps, or caulked areas for water to intrude in.
There is a good guide posted periodically on tiers of leak resistance. CH is top dog, but one might look at Lazy Daze or another top tier brand as well for build quality.