Choosing to get fixed appliances for your children is an important decision. Nowadays the traditional train track braces may not be the only option, with braces like Invisalign available. There is a big difference in cost though, with the new technology being a lot more expensive and requiring more visits to the dentist for adjustments.
I think though, that if only for aesthetic reasons, that avoiding ugly train track braces would be best to keep your kids happy.
I had to wear mine later in life and I was always so self-conscious. I would have definitely preferred something invisible while my teeth were being fixed.