Count Chocula is the best for late-night, omg I've been smoking weed for 4 hours and I need some cereal. The bonus is that it leaves you with some decent chocolate milk at the end.
Booberry is a subtle flavor best observed in the morning.
Frankenberry isn't that great, but it's better than Strawberry Quick so it's where you go if you're craving that strawberry TM flavor.
The real question is, Count Chocula or Cocoa Pebbles?
Answer is Cocoa Pebbles > Fruity Pebbles > Count Chocula.
The Monster cereals were better in the 80's than they are today for some reason, I'm sure Google has an answer. The Pebbles cereals have surpassed the Monster cereals as far as strong flavor.
edit: The only thing Captain Crunch was good for, other than shredding the roof of your mouth, was the toy. What a horrible cereal Captain Crunch was, and is. And likely will be.