Newmars gassers are nice but the Tiffin gassers have nicer cabinetry—solid wood for all Tiffins and vinyl wrap on many Newmars. Newmar gassers often use scrap wall panel for drawer bottoms, Tiffin uses wood. Tiffins are often on a longer wheelbase and heavier chassis for a given length. Canyon Star is closest to Tiffin in quality of cabinets and in use of heavier chassis—all Canyon Stars are on the 26K chassis. Only the Canyon Star has a flush stove cover. On the other hand Newmar has hung walls if you dig that and some have available double pane windows—all Tiffin gassers are single pane.
IMO Winnebago gassers don’t come close to either Newmar or Tiffin when it comes to bones.