My daughter is 10 and my son is 6 so we still have a lot of stages to go through. This is a really difficult question for me to answer. They are challenging and easier in their own ways. My son was by far the easier baby through 2 year old. So far he has been much more difficult ages 3-6. I anticipate my son being easier and less emotional as a teen, but who knows. They are both brilliant, stubborn, funny, emotional and manipulative in their own ways.