Comfort Inns are supposed to be higher up the hierarchy than Quality Inns. Since Choice Hotels are not consistent within brands, like Holiday Inn Express or Hampton Inn, Comfort Inns and Quality Inns seem very similar. I have stayed at Comfort Inns that should be classified as Econo Lodge, and Quality Inns that rival Holiday Inn Express or Hampton Inn. This my observation in the US, so it could be different in other countries.