I'm working on a project with several objects like this and they are causing me a lot of frustration. I'd like some advice on the best way to divide faces and unwrap an object like this. I've tried dozens of versions and I can't get away from mesh artifacts. I believe the primary challenge is getting the mesh divided into relatively consistent quads. Shading smooth cleans up the faceting but introduces the stretch marks. Shading flat eliminates the stretch marks but the arches are faceted again. I've run into this in the past and it is an area that I'm obviously lacking some basic information and experience.
Again, I've done many versions. These are just representative of the basic attempts. I'd love some "best practices" workflow advice on this.
It may be worth noting that the basic shape was created in Sketchup since I can draw consistent arches in 3 clicks. It was then imported as an .obj and the face was extruded to the current shape.