Since my favorite donut wasn't listed I'd have to go with chocolate frosted. I've had some yummy Boston Cream donuts but only from a bakery not a chain or franchise.
I am the same way, not a huge donut fan. I don't buy them for myself but when I was still going into the office if someone had brought in donuts I would have one. I actually prefer bagels. We have a deli here in Columbus that makes really good bagels. When I would take in something for the office I would bring in assorted bagels and cream cheese.