I know I'm going to get laughed at for saying this, but I've never really been able to tell the difference between major donut brands. Krispy Kreme, Fractured Prune and Dunkin Donuts are basically identical, with the one exception if you get a super warm, gooey Krispy Kreme donut right as it's been made. However, I dislike warm donuts so I never get them like that, anyway.
Hell, even my local grocery store bakery donuts taste like the major chains' donuts as long as you get them in the morning or early afternoon.