Honestly, this is a bad questions. The questions should be who overall will do a better job!!!!! MARRIED MOMS!!!
I selected this option because married moms have the help of their partner. Especially if their both working and there is a equal part in their responsibilities and parenting roles, then yes married moms have it all whole lot better than most single mothers that are doing things on their own with one income.
double income
double help around the house