@sumatranate great article :)
In regards to which is more difficult - the answer is both and neither. As a father of 3 with a 4th on the way - I’ve found that the kid themselves makes the biggest difference on how difficult it is to teach and parent.
My biggest advice for parents would be to remember that kids learn at their pace - our job is just to teach and be consistent. Often the lessons need to be repeated multiple times before it feels like it’s making an impact.
Sometimes the kiddo may not be ready for the lesson - but we don’t really know when they will be - that’s why we just have to be consistent, Breathe deep, and be patient.