We have two Chow Chows and two Shar Peis and three cats.
We also have a five-year-old son and a two-year-old son.
I would not own other breeds of dogs (mostly because I prefer a dog that isn't too active or affectionate) but I don't think these two breeds are for everyone. You need to be a strong leader, for Chow Chows especially, because they are pretty stubborn animals.
I don't think people should leave young children alone with dogs, any dogs. When my sons were very young and learning to walk, one of the Chow Chows would always sit right next to them so that if they fell, they would fall on him and not the ground. Another would always stand by the door or the gate in the yard (depending on where we are) just in case the child felt like leaving.
So, everything I read about Chow Chows (that they're horrible with kids, that they attack cats, that they'll eat anyone that comes near you, etc.) has not been true in our case. Yes, they are protective of their people. They are most certainly not for everyone. But they are most definitely for us.
Feel free to PM me if you have specific breed questions; my husband has owned Chow Chows and Chow mixes for almost twenty years.