OK, we have the best steak thread, now here is a best doughnut thread.
Is, or at least there was, a place in Redlands, CA, called Mr. J's, that I would nominate for best doughnut. Redlands blvd and Alabama st. IIRC
A place in Tulsa, I think it was Harmonys, was a close second, and Geralds in OKC used to have the best orange doughnuts as well as the best apple spice doughnuts.