The exterior door (front or rear) is a functional asset and has a bearing on first impressions. An attractive door can take the form of paneled, solid wood, sliding glass or other types.
The fact is that there are a few regional manufacturers who make specific types or styles which are then distributed through local markets. Attributes to be aware of would have to do with the quality of materials and the intricacy of design. Less obvious would be interior quality, materials and construction that prevents moisture transfer utilizing a 'thermal-break' within the framework. Some higher quality door manufacturers also use high impact glass, especially with doors that feature side windows, offering more security. Another feature of quality and security would be found in the more robust frame work of the door and jamb.
These are some of the concerns buyers should be asking when considering a door replacement or home building.