The CfE and PYP both have a child centered approach to the teaching and learning, where the children are very involved and active in their own education.
The PYP is structured to educate children globally, learning all about the world and cultures around them. It allows pupils to think for themselves and does not follow as strict a curriculum as the CfE.
Both the PYP and IB take on different approaches to the curriculum. The PYP takes on a more fluid approach to learning whereas the CfE has a firmer structure in place.
Both systems are effective in their own ways and have their own advantages and disadvantages on the pupils.