Cheerios in the UK are totally different to those in the US, I think it's important to read all the ingredients in any cereal because they vary country to country.
I still give DS baby muesli (made into balls as finger food) because he won't eat wheatabix, regular muesli, porridge or ready break and tbh they are the only cereals I'd be willing to offer. I know the baby cereal is more expensive but the one I buy is so much healthier than other cereals I feel it's worth the cost. I don't consider cereal in the UK to be good nutritional value or a good start to the day. I mix it up with toast (with pate, cream cheese or marmite), eggy bread, pancakes and even prefer him to have a couple of home made sugar free muffins rather than regular cereal.
It's a hard decision to make which cereal to go for, hope you find something you're happy with x