Which cereal is healthiest for you & why ?

Im basically trying to figure out which of the 3 cereals will be the healthiest choose to eat from. The cereals I choose were Cheerios , Frosted Flakes , Golden Grahams . My hypothesis is that i think the Cheerios is going to be the most healthiest of them all & the Frosted Flakes will most likely be the the most unhealthiest. I felt is those the cheerios would be the best because its had the least amount of calories & other facts in the nutrients facts. 

In the serving size for all the products frosted flakes was the one with the most serving of 1 box.

Cheerios had the smallest amount of calories of 100 & frosted flakes had 130 & Golden Grahams had a amount of 120.The total fats were frosted flakes had none & golden grahams with 1g , cheerios had 2g.

All of the three products had 0 in cholesterol. They all were very high in sodium with frosted flakes having 170 , & Golden Grahams having 270 & lastly Cheerios with 190. Frosted flakes was the one with the highest in carbohydrates with 31. The dietary fibers were very low with number of 1 from both frosted flakes and golden grahams & cheerios with a 3.Mainly all of the products were high in nutrients with calcium and iron,vitamin a & c.

My hypothesis was clearly wrong because i thought that cheerios was the healthiest & frosted flakes would be the most unhealthiest.Which in fact this is wrong because well cheerios is the healthiest but frosted flakes is not the most unhealthiest.In fact Golden Grahams is the most unhealthiest just because its so high in sodium and has more higher counts in things than the other two.

The serving sizes listed were for frosted flakes 1 box and for the other two Golden Graham had 3/4 cups and Cheerios had 1 cup serving. Yes i believe that the servings they had are normal serving sizes because mainly i do usually eat 1 cup or cereal.