My favorite is probably between Frosted Flakes and Cocoa Pebbles. I've always liked Frosted Flakes (cause they're grrreat), it tastes especially good with bananas. I don't have it all the time, though. As for Cocoa Pebbles, I've learned to enjoy it more as an adult hilariously. It doesn't feel as intense or as sugary as other chocolate cereals.
I also enjoy eating Corn Pops (more as a snack, it tastes best that way imo!), Honey Comb, Captain Crunch, and Rice Krispies. I'm not a huge fan of marshmallows (they're too too sugary and it just tastes weird) or fruity cereals (I prefer to put actual fruit instead like bananas).
I'm kinda tempted to eat more cereal. =v=