I live in Florida, so my opinion on what is best may not be applicable to Michigan, & may require modification.
I work for the engineering division of a municipality & see much paving in both. I have also spent 10 years working for engineering firms in the private sector. My experience here indicates concrete is better for the Florida climate - 4" of 3000 psi standard mix and 6x6x10 welded wire mesh. Some municipalities require 6" of concrete within the right-of-way (from property line to edge of travel lane), & that works really well too.
Many batch plants are pushing high fly ash content mix so they make a better profit. Although that mix will produce acceptable compression test results, it will shear, crack, & wear prematurely. I have seen roadway curbing turn to dust in less than a year, & have had one developer replace over 12,000 linear feet of type "F" curb because of a non-standard mix.
