Not to nitpick too much, but (paraphrasing) when the boy is pleased with himself for being smart and able to draw well, the girl answers that she’s pleased with herself when she’s on good terms with God and Jesus.

This reveals such a difference in upbringing environment that you can’t draw too many conclusions from the video. The starting point for each child is too different. Additionally the gender difference makes it very difficult too.

I know it’s not a rigorous scientific experiment, but the video does want you to compare the children.