TOD
The sugary ones, for sure, the big favorites being Frosted Flakes and Sugar Smacks. Trix, too, later on. Corn pops were sugared, too, right? I never went for the real candy-ish cereals (no chocolate anything, please, in my breakfast), and many of today's cereals sound disgusting. I always loved Raisin Bran, and would sugar that up myself.
Chex and Rice Krispies were okay, but on a second tier for me.
I ate the non-sugary cereals just fine by adding sugar, but was never too crazy about shredded wheat (which seemed to require "work") or grape nuts which I found to be a chore to eat.
I don't eat cereal now, but I know some people, like my dad, never gave it up and can hardly start a day without a bowl of cereal. These tend to be the people who rarely go for a hot eggs & meat breakfast, I think. I could easily, btw, pick up a box or two of the above favorites and binge like crazy and love every minute of it. No question about it. But to the extent I'm able to exercise any self-control in foods at all, it seems to cover that pretty well.