The best of the three in my opinion is the Honey Nut Cheerios. These are just like Honey Nut Cheerios Cereal, except you also get the milk filling. Additionally, each bar has to be held together somehow. I find a hint of a caramel taste in the corn syrup which seems to comprise what holds them together. It makes the honey nut cheerios bars slightly sweeter than the other two varieties. Within the past year, General Mills has changed the makeup of the Honey Nut Cheerios bars, and they are sweeter than they were before. I liked the old flavor better, but these are still delicious!
Serve however you like. It is delicious as is, or you can put a little butter on top, sprinkle with some nuts, or add some cream. I did alter my version a little bit. Instead of the raisins I topped my oatmeal with blueberries after I removed it from the oven.