Sometimes, as in my case, first-time investors who create their own business plans and do not illicit the services of a carwash consultant must try and save $ wherever they can. Cost savings were the main reason I chose a metal building.
I was attracted to the ribbed steel look to me I didn't compromise on appearance. My building is also about 1/3 concrete (4' foundation wall).
New construction is tricky, especially for first-time investors.
I guess it depends on your long-term goals for the project, too. Many businesspeople who own real estate look at the life of a project and the value of the land vs that of the business and its improvements. Some investors want to use up the assets making money; if the building wears out, so be it. Others may want to create a family business with longevity of everything, including buildings and machinery.
There's no one right answer here.