Not sure I ever had a favorite, definitely tiers though something along the lines of:
Tier 1:
Apple Jacks, Boo Berry, Captain Crunch Peanut Butter, Cinnamon Toast Crunch, Cookie Crisp, Count Chocula, French Toast Crunch, Frosted Cheerios, Frosted Wheaties, Fruity Pebbles, Golden Grahams, Lucky Charms, Life Cinnamon, Pops, Reese Puffs, Rice Krispies Treats, Waffle Crisp
Tier 2:
Berry Kix, Cocoa Krispies, Froot Loops, Frosted Flakes, Honey Bunches of Oats, Honey Nut Cheerios, Trix
Tier 3:
Whatever my parents ate as a last resort after being cracked out and finishing the above boxes of cereal and having to wait a few days until mom bought next "week's" supply