Lack of disease and pests(lice/mites)....huge factor.Aside from the cuteness factor, which my grandkids will probably insist on, what are the advantages of chicks over hens?
Birds will be more 'tame', if handled correctly, pretty huge too when kids are involved.
Brooding chicks adds an extra learning curve and equipment.
Planning your coop to have a separate but adjacent space for isolation/additions is a very good idea. I'm glad I did it in my coop, wish I had made that space a bit bigger.
Will you have power to your coop?
What is your location/climate?
Adding this to your profile like this is good: