Check out this sub-forum
https://www.bikeforums.net/recreational-family/
There have been many questions similar to the one you are asking. Sometimes components do matter. Kids have trouble with brake handles not sized properly and especially twist grip shifters that may be hard for a child to turn. Since you will want the lightest bike for the money, skip those with the near useless shocks. They add unnecessary weight to the bike while rarely offering any additional comfort.