The only thing you need to get at Krispy Kreme is their normal glazed donut. I made the mistake of buying into their other donuts and they're all alright. However their glazed donuts ARE the best in my opinion. But you should only get them when they're made fresh. Usually it's all the time, but you can always check by finding the bright red neon light that means they're making fresh donuts.
The reason why the glazed donuts are the best is because of how lite they are. They are flaky, lite, and full of glazed goodness! They are best when they are just made so you can have the warm inside of the donut.
My tip to people is to always go when they open. I don't really trust getting donuts later on in the day because you don't know how long they've been standing there.
Tips: Only buy the glazed donuts, the other donuts are just so-so.